21221212121022 has 32 divisors (see below), whose sum is σ = 43669399213440. Its totient is φ = 6871059286560.

The previous prime is 21221212120963. The next prime is 21221212121063. The reversal of 21221212121022 is 22012121212212.

It is a super-2 number, since 2×21221212121022² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21221212121022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227170872 + ... + 227264267.

It is an arithmetic number, because the mean of its divisors is an integer number (1364668725420).

Almost surely, 2^{21221212121022} is an apocalyptic number.

21221212121022 is an abundant number, since it is smaller than the sum of its proper divisors (22448187092418).

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

21221212121022 is a wasteful number, since it uses less digits than its factorization.

21221212121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454435368.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21221212121022 its reverse (22012121212212), we get a palindrome (43233333333234).

The spelling of 21221212121022 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, twenty-two".