21221102020012 has 12 divisors (see below), whose sum is σ = 37136961093960. Its totient is φ = 10610541707456.

The previous prime is 21221102019973. The next prime is 21221102020051. The reversal of 21221102020012 is 21002020112212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21221102019973) and next prime (21221102020051).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6693303 + ... + 9340369.

It is an arithmetic number, because the mean of its divisors is an integer number (3094746757830).

Almost surely, 2^{21221102020012} is an apocalyptic number.

It is an amenable number.

21221102020012 is a deficient number, since it is larger than the sum of its proper divisors (15915859073948).

21221102020012 is a wasteful number, since it uses less digits than its factorization.

21221102020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4651280 (or 4651278 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221102020012 its reverse (21002020112212), we get a palindrome (42223122132224).

The spelling of 21221102020012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, twenty thousand, twelve".