21221001112012 has 24 divisors (see below), whose sum is σ = 40029038306096. Its totient is φ = 9785586621888.

The previous prime is 21221001112009. The next prime is 21221001112021. The reversal of 21221001112012 is 21021110012212.

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, 181640703 + ... + 181757494.

Almost surely, 2^{21221001112012} is an apocalyptic number.

It is an amenable number.

21221001112012 is a deficient number, since it is larger than the sum of its proper divisors (18808037194084).

21221001112012 is a wasteful number, since it uses less digits than its factorization.

21221001112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363399337 (or 363399335 counting only the distinct ones).

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

Adding to 21221001112012 its reverse (21021110012212), we get a palindrome (42242111124224).

The spelling of 21221001112012 in words is "twenty-one trillion, two hundred twenty-one billion, one million, one hundred twelve thousand, twelve".