20002002101021 has 16 divisors (see below), whose sum is σ = 21170491630848. Its totient is φ = 18876295401600.

The previous prime is 20002002100987. The next prime is 20002002101047. The reversal of 20002002101021 is 12010120020002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20002002101021 - 2²² = 20001997906717 is a prime.

It is a super-3 number, since 3×20002002101021³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002002100993 and 20002002101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002002101051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64668161 + ... + 64976726.

It is an arithmetic number, because the mean of its divisors is an integer number (1323155726928).

Almost surely, 2^{20002002101021} is an apocalyptic number.

It is an amenable number.

20002002101021 is a deficient number, since it is larger than the sum of its proper divisors (1168489529827).

20002002101021 is a wasteful number, since it uses less digits than its factorization.

20002002101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129645052.

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

Adding to 20002002101021 its reverse (12010120020002), we get a palindrome (32012122121023).

The spelling of 20002002101021 in words is "twenty trillion, two billion, two million, one hundred one thousand, twenty-one".