21221344312212 has 48 divisors (see below), whose sum is σ = 55477912416192. Its totient is φ = 6256907412480.

The previous prime is 21221344312199. The next prime is 21221344312271.

21221344312212 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21221344312212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2172532413 + ... + 2172542180.

It is an arithmetic number, because the mean of its divisors is an integer number (1155789842004).

Almost surely, 2^{21221344312212} is an apocalyptic number.

21221344312212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221344312212 is an abundant number, since it is smaller than the sum of its proper divisors (34256568103980).

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

21221344312212 is a wasteful number, since it uses less digits than its factorization.

21221344312212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4345074648 (or 4345074646 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

It can be divided in two parts, 2122134 and 4312212, that added together give a palindrome (6434346).

The spelling of 21221344312212 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred forty-four million, three hundred twelve thousand, two hundred twelve".