21002222121022 has 32 divisors (see below), whose sum is σ = 33078194519040. Its totient is φ = 9987872859840.

The previous prime is 21002222120987. The next prime is 21002222121029. The reversal of 21002222121022 is 22012122220012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002222121029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15659613 + ... + 16947799.

It is an arithmetic number, because the mean of its divisors is an integer number (1033693578720).

Almost surely, 2^{21002222121022} is an apocalyptic number.

21002222121022 is a deficient number, since it is larger than the sum of its proper divisors (12075972398018).

21002222121022 is a wasteful number, since it uses less digits than its factorization.

21002222121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292736.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21002222121022 its reverse (22012122220012), we get a palindrome (43014344341034).

The spelling of 21002222121022 in words is "twenty-one trillion, two billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-two".