21122212010212 has 24 divisors (see below), whose sum is σ = 37104239735640. Its totient is φ = 10521069158400.

The previous prime is 21122212010189. The next prime is 21122212010257. The reversal of 21122212010212 is 21201021222112.

It can be written as a sum of positive squares in 4 ways, for example, as 13583101896676 + 7539110113536 = 3685526^2 + 2745744^2 .

It is a super-2 number, since 2×21122212010212² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122212010212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7328593 + ... + 9795544.

It is an arithmetic number, because the mean of its divisors is an integer number (1546009988985).

Almost surely, 2^{21122212010212} is an apocalyptic number.

It is an amenable number.

21122212010212 is a deficient number, since it is larger than the sum of its proper divisors (15982027725428).

21122212010212 is a wasteful number, since it uses less digits than its factorization.

21122212010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17125311 (or 17125309 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21122212010212 its reverse (21201021222112), we get a palindrome (42323233232324).

The spelling of 21122212010212 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twelve million, ten thousand, two hundred twelve".