21120011111212 has 36 divisors (see below), whose sum is σ = 40619136532296. Its totient is φ = 9602209393920.

The previous prime is 21120011111207. The next prime is 21120011111231. The reversal of 21120011111212 is 21211111002112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233108589 + ... + 233199172.

Almost surely, 2^{21120011111212} is an apocalyptic number.

It is an amenable number.

21120011111212 is a deficient number, since it is larger than the sum of its proper divisors (19499125421084).

21120011111212 is a wasteful number, since it uses less digits than its factorization.

21120011111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466307858 (or 466307843 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21120011111212 its reverse (21211111002112), we get a palindrome (42331122113324).

The spelling of 21120011111212 in words is "twenty-one trillion, one hundred twenty billion, eleven million, one hundred eleven thousand, two hundred twelve".