21131212000222 has 4 divisors (see below), whose sum is σ = 31696818000336. Its totient is φ = 10565606000110.

The previous prime is 21131212000189. The next prime is 21131212000253. The reversal of 21131212000222 is 22200021213112.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21131212000222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282803000054 + ... + 5282803000057.

It is an arithmetic number, because the mean of its divisors is an integer number (7924204500084).

Almost surely, 2^{21131212000222} is an apocalyptic number.

21131212000222 is a deficient number, since it is larger than the sum of its proper divisors (10565606000114).

21131212000222 is a wasteful number, since it uses less digits than its factorization.

21131212000222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10565606000113.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21131212000222 its reverse (22200021213112), we get a palindrome (43331233213334).

The spelling of 21131212000222 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred twelve million, two hundred twenty-two", and thus it is an aban number.