21002002121022 has 16 divisors (see below), whose sum is σ = 45235081491600. Its totient is φ = 6462154498752.

The previous prime is 21002002120993. The next prime is 21002002121029. The reversal of 21002002121022 is 22012120020012.

It is a junction number, because it is equal to n+sod(n) for n = 21002002120992 and 21002002121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002002121029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134628218647 + ... + 134628218802.

It is an arithmetic number, because the mean of its divisors is an integer number (2827192593225).

Almost surely, 2^{21002002121022} is an apocalyptic number.

21002002121022 is an abundant number, since it is smaller than the sum of its proper divisors (24233079370578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002002121022 is a wasteful number, since it uses less digits than its factorization.

21002002121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269256437467.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002002121022 its reverse (22012120020012), we get a palindrome (43014122141034).

The spelling of 21002002121022 in words is "twenty-one trillion, two billion, two million, one hundred twenty-one thousand, twenty-two".