20100202201021 has 16 divisors (see below), whose sum is σ = 21271337268480. Its totient is φ = 18953880816640.

The previous prime is 20100202200977. The next prime is 20100202201127. The reversal of 20100202201021 is 12010220200102.

It is a happy number.

It is not a de Polignac number, because 20100202201021 - 2⁷ = 20100202200893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100202200992 and 20100202201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100202201921) 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, 18970845 + ... + 20002333.

It is an arithmetic number, because the mean of its divisors is an integer number (1329458579280).

Almost surely, 2^{20100202201021} is an apocalyptic number.

It is an amenable number.

20100202201021 is a deficient number, since it is larger than the sum of its proper divisors (1171135067459).

20100202201021 is a wasteful number, since it uses less digits than its factorization.

20100202201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043516.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20100202201021 its reverse (12010220200102), we get a palindrome (32110422401123).

The spelling of 20100202201021 in words is "twenty trillion, one hundred billion, two hundred two million, two hundred one thousand, twenty-one".