21211210221012 has 120 divisors (see below), whose sum is σ = 64567457894016. Its totient is φ = 5945999596992.

The previous prime is 21211210221001. The next prime is 21211210221167. The reversal of 21211210221012 is 21012201211212.

21211210221012 is a `hidden beast` number, since 21 + 211 + 210 + 2 + 210 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 88109848 + ... + 88350255.

Almost surely, 2^{21211210221012} is an apocalyptic number.

It is an amenable number.

21211210221012 is an abundant number, since it is smaller than the sum of its proper divisors (43356247673004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211210221012 is a wasteful number, since it uses less digits than its factorization.

21211210221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176460179 (or 176460168 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21211210221012 its reverse (21012201211212), we get a palindrome (42223411432224).

The spelling of 21211210221012 in words is "twenty-one trillion, two hundred eleven billion, two hundred ten million, two hundred twenty-one thousand, twelve".