13421221764372 has 18 divisors (see below), whose sum is σ = 33925866126698. Its totient is φ = 4473740588112.

The previous prime is 13421221764371. The next prime is 13421221764409. The reversal of 13421221764372 is 27346712212431.

It is a happy number.

13421221764372 is a `hidden beast` number, since 1 + 3 + 4 + 2 + 1 + 2 + 217 + 64 + 372 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12957019371396 + 464202392976 = 3599586^2 + 681324^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421221764371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186405857803 + ... + 186405857874.

Almost surely, 2^{13421221764372} is an apocalyptic number.

13421221764372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13421221764372 is an abundant number, since it is smaller than the sum of its proper divisors (20504644362326).

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

13421221764372 is a wasteful number, since it uses less digits than its factorization.

13421221764372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372811715687 (or 372811715682 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The spelling of 13421221764372 in words is "thirteen trillion, four hundred twenty-one billion, two hundred twenty-one million, seven hundred sixty-four thousand, three hundred seventy-two".