20102011010021 has 4 divisors (see below), whose sum is σ = 20795183803500. Its totient is φ = 19408838216544.

The previous prime is 20102011009999. The next prime is 20102011010033. The reversal of 20102011010021 is 12001011020102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7369324622500 + 12732686387521 = 2714650^2 + 3568289^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102011010021 - 2²⁶ = 20101943901157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102011009984 and 20102011010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102011030021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346586396696 + ... + 346586396753.

It is an arithmetic number, because the mean of its divisors is an integer number (5198795950875).

Almost surely, 2^{20102011010021} is an apocalyptic number.

It is an amenable number.

20102011010021 is a deficient number, since it is larger than the sum of its proper divisors (693172793479).

20102011010021 is an equidigital number, since it uses as much as digits as its factorization.

20102011010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693172793478.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20102011010021 its reverse (12001011020102), we get a palindrome (32103022030123).

The spelling of 20102011010021 in words is "twenty trillion, one hundred two billion, eleven million, ten thousand, twenty-one".