21222212122110 has 64 divisors (see below), whose sum is σ = 53694964260864. Its totient is φ = 5360174361600.

The previous prime is 21222212122109. The next prime is 21222212122151. The reversal of 21222212122110 is 1122121222212.

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, 242717811 + ... + 242805230.

It is an arithmetic number, because the mean of its divisors is an integer number (838983816576).

Almost surely, 2^{21222212122110} is an apocalyptic number.

21222212122110 is an abundant number, since it is smaller than the sum of its proper divisors (32472752138754).

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

21222212122110 is a wasteful number, since it uses less digits than its factorization.

21222212122110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485523129.

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

Adding to 21222212122110 its reverse (1122121222212), we get a palindrome (22344333344322).

The spelling of 21222212122110 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-two thousand, one hundred ten".