21121100212012 has 24 divisors (see below), whose sum is σ = 37121120343216. Its totient is φ = 10515067196928.

The previous prime is 21121100212001. The next prime is 21121100212031. The reversal of 21121100212012 is 21021200112112.

It is a super-2 number, since 2×21121100212012² (a number of 27 digits) contains 22 as substring.

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, 83682228 + ... + 83934244.

It is an arithmetic number, because the mean of its divisors is an integer number (1546713347634).

Almost surely, 2^{21121100212012} is an apocalyptic number.

It is an amenable number.

21121100212012 is a deficient number, since it is larger than the sum of its proper divisors (16000020131204).

21121100212012 is a wasteful number, since it uses less digits than its factorization.

21121100212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342177 (or 342175 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121100212012 its reverse (21021200112112), we get a palindrome (42142300324124).

The spelling of 21121100212012 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, two hundred twelve thousand, twelve".