21221012012 has 12 divisors (see below), whose sum is σ = 37138358880. Its totient is φ = 10610052336.

The previous prime is 21221011961. The next prime is 21221012063. The reversal of 21221012012 is 21021012212.

It is an interprime number because it is at equal distance from previous prime (21221011961) and next prime (21221012063).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5738 + ... + 206094.

It is an arithmetic number, because the mean of its divisors is an integer number (3094863240).

Almost surely, 2^21221012012 is an apocalyptic number.

It is an amenable number.

21221012012 is a deficient number, since it is larger than the sum of its proper divisors (15917346868).

21221012012 is a wasteful number, since it uses less digits than its factorization.

21221012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226840 (or 226838 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221012012 its reverse (21021012212), we get a palindrome (42242024224).

The spelling of 21221012012 in words is "twenty-one billion, two hundred twenty-one million, twelve thousand, twelve".