20002102010021 has 4 divisors (see below), whose sum is σ = 20002363616844. Its totient is φ = 20001840403200.

The previous prime is 20002102010003. The next prime is 20002102010039. The reversal of 20002102010021 is 12001020120002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20002102010003) and next prime (20002102010039).

It can be written as a sum of positive squares in 2 ways, for example, as 1634140372225 + 18367961637796 = 1278335^2 + 4285786^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002102010021 - 2³⁴ = 19984922140837 is a prime.

It is a super-2 number, since 2×20002102010021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20002102009984 and 20002102010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002108010021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130688690 + ... + 130841651.

It is an arithmetic number, because the mean of its divisors is an integer number (5000590904211).

Almost surely, 2^{20002102010021} is an apocalyptic number.

It is an amenable number.

20002102010021 is a deficient number, since it is larger than the sum of its proper divisors (261606823).

20002102010021 is an equidigital number, since it uses as much as digits as its factorization.

20002102010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261606822.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20002102010021 its reverse (12001020120002), we get a palindrome (32003122130023).

The spelling of 20002102010021 in words is "twenty trillion, two billion, one hundred two million, ten thousand, twenty-one".