21221101010012 has 24 divisors (see below), whose sum is σ = 37191823074000. Its totient is φ = 10594870909056.

The previous prime is 21221101009993. The next prime is 21221101010027. The reversal of 21221101010012 is 21001010112212.

It is a congruent number.

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, 16218539 + ... + 17478077.

It is an arithmetic number, because the mean of its divisors is an integer number (1549659294750).

Almost surely, 2^{21221101010012} is an apocalyptic number.

It is an amenable number.

21221101010012 is a deficient number, since it is larger than the sum of its proper divisors (15970722063988).

21221101010012 is a wasteful number, since it uses less digits than its factorization.

21221101010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265765 (or 1265763 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221101010012 its reverse (21001010112212), we get a palindrome (42222111122224).

The spelling of 21221101010012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, ten thousand, twelve".