21010022110021 has 12 divisors (see below), whose sum is σ = 24450486013632. Its totient is φ = 18001033171128.

The previous prime is 21010022109971. The next prime is 21010022110031. The reversal of 21010022110021 is 12001122001012.

It is not a de Polignac number, because 21010022110021 - 2⁹ = 21010022109509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010022109983 and 21010022110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010022110031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89848815 + ... + 90082348.

It is an arithmetic number, because the mean of its divisors is an integer number (2037540501136).

Almost surely, 2^{21010022110021} is an apocalyptic number.

It is an amenable number.

21010022110021 is a deficient number, since it is larger than the sum of its proper divisors (3440463903611).

21010022110021 is a wasteful number, since it uses less digits than its factorization.

21010022110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179933560 (or 179933553 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21010022110021 its reverse (12001122001012), we get a palindrome (33011144111033).

The spelling of 21010022110021 in words is "twenty-one trillion, ten billion, twenty-two million, one hundred ten thousand, twenty-one".