21102211120212 has 72 divisors (see below), whose sum is σ = 55151042037000. Its totient is φ = 6798027679488.

The previous prime is 21102211120187. The next prime is 21102211120247. The reversal of 21102211120212 is 21202111220112.

21102211120212 is a `hidden beast` number, since 2 + 110 + 221 + 1 + 120 + 212 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 99550346256 + 21002660773956 = 315516^2 + 4582866^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52964287 + ... + 53361222.

Almost surely, 2^{21102211120212} is an apocalyptic number.

It is an amenable number.

21102211120212 is an abundant number, since it is smaller than the sum of its proper divisors (34048830916788).

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

21102211120212 is a wasteful number, since it uses less digits than its factorization.

21102211120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106325705 (or 106325700 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21102211120212 its reverse (21202111220112), we get a palindrome (42304322340324).

The spelling of 21102211120212 in words is "twenty-one trillion, one hundred two billion, two hundred eleven million, one hundred twenty thousand, two hundred twelve".