21000021121022 has 64 divisors (see below), whose sum is σ = 33464534482944. Its totient is φ = 9866097457920.

The previous prime is 21000021120973. The next prime is 21000021121031. The reversal of 21000021121022 is 22012112000012.

It is a junction number, because it is equal to n+sod(n) for n = 21000021120988 and 21000021121006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3457928978 + ... + 3457935050.

It is an arithmetic number, because the mean of its divisors is an integer number (522883351296).

Almost surely, 2^{21000021121022} is an apocalyptic number.

21000021121022 is a deficient number, since it is larger than the sum of its proper divisors (12464513361922).

21000021121022 is a wasteful number, since it uses less digits than its factorization.

21000021121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9033.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000021121022 its reverse (22012112000012), we get a palindrome (43012133121034).

The spelling of 21000021121022 in words is "twenty-one trillion, twenty-one million, one hundred twenty-one thousand, twenty-two".