21122102212212 has 48 divisors (see below), whose sum is σ = 50234761144512. Its totient is φ = 6905660974080.

The previous prime is 21122102212163. The next prime is 21122102212241. The reversal of 21122102212212 is 21221220122112.

It is a super-2 number, since 2×21122102212212² (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 15 ways as a sum of consecutive naturals, for example, 40613178 + ... + 41129969.

It is an arithmetic number, because the mean of its divisors is an integer number (1046557523844).

Almost surely, 2^{21122102212212} is an apocalyptic number.

It is an amenable number.

21122102212212 is an abundant number, since it is smaller than the sum of its proper divisors (29112658932300).

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

21122102212212 is a wasteful number, since it uses less digits than its factorization.

21122102212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81743568 (or 81743566 counting only the distinct ones).

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

Adding to 21122102212212 its reverse (21221220122112), we get a palindrome (42343322334324).

The spelling of 21122102212212 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred two million, two hundred twelve thousand, two hundred twelve".