21102021201021 has 32 divisors (see below), whose sum is σ = 28395848880000. Its totient is φ = 13938653000448.

The previous prime is 21102021201011. The next prime is 21102021201083. The reversal of 21102021201021 is 12010212020112.

It is not a de Polignac number, because 21102021201021 - 2⁵ = 21102021200989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102021201011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1028904915 + ... + 1028925423.

It is an arithmetic number, because the mean of its divisors is an integer number (887370277500).

Almost surely, 2^{21102021201021} is an apocalyptic number.

It is an amenable number.

21102021201021 is a deficient number, since it is larger than the sum of its proper divisors (7293827678979).

21102021201021 is a wasteful number, since it uses less digits than its factorization.

21102021201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27053.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21102021201021 its reverse (12010212020112), we get a palindrome (33112233221133).

The spelling of 21102021201021 in words is "twenty-one trillion, one hundred two billion, twenty-one million, two hundred one thousand, twenty-one".