21102222021222 has 64 divisors (see below), whose sum is σ = 43828797358080. Its totient is φ = 6765271169664.

The previous prime is 21102222021211. The next prime is 21102222021271. The reversal of 21102222021222 is 22212022220112.

It is a super-2 number, since 2×21102222021222² (a number of 27 digits) contains 22 as substring.

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, 52915023 + ... + 53312325.

It is an arithmetic number, because the mean of its divisors is an integer number (684824958720).

Almost surely, 2^{21102222021222} is an apocalyptic number.

21102222021222 is an abundant number, since it is smaller than the sum of its proper divisors (22726575336858).

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

21102222021222 is a wasteful number, since it uses less digits than its factorization.

21102222021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398517.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21102222021222 its reverse (22212022220112), we get a palindrome (43314244241334).

The spelling of 21102222021222 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-two".