21221102021022 has 48 divisors (see below), whose sum is σ = 46127395611648. Its totient is φ = 7050915326160.

The previous prime is 21221102021017. The next prime is 21221102021023. The reversal of 21221102021022 is 22012020112212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21221102020986 and 21221102021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221102021023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5487363 + ... + 8517825.

It is an arithmetic number, because the mean of its divisors is an integer number (960987408576).

Almost surely, 2^{21221102021022} is an apocalyptic number.

21221102021022 is an abundant number, since it is smaller than the sum of its proper divisors (24906293590626).

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

21221102021022 is a wasteful number, since it uses less digits than its factorization.

21221102021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031725 (or 3031722 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221102021022 its reverse (22012020112212), we get a palindrome (43233122133234).

The spelling of 21221102021022 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, twenty-one thousand, twenty-two".