21121200111212 has 12 divisors (see below), whose sum is σ = 37127849524416. Its totient is φ = 10513243104240.

The previous prime is 21121200111161. The next prime is 21121200111239. The reversal of 21121200111212 is 21211100212112.

It is a super-2 number, since 2×21121200111212² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11839236839 + ... + 11839238622.

It is an arithmetic number, because the mean of its divisors is an integer number (3093987460368).

Almost surely, 2^{21121200111212} is an apocalyptic number.

It is an amenable number.

21121200111212 is a deficient number, since it is larger than the sum of its proper divisors (16006649413204).

21121200111212 is a wasteful number, since it uses less digits than its factorization.

21121200111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23678475688 (or 23678475686 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121200111212 its reverse (21211100212112), we get a palindrome (42332300323324).

The spelling of 21121200111212 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred million, one hundred eleven thousand, two hundred twelve".