13442401621 has 4 divisors (see below), whose sum is σ = 14664438144. Its totient is φ = 12220365100.

The previous prime is 13442401603. The next prime is 13442401667. The reversal of 13442401621 is 12610424431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13442401621 - 2⁷ = 13442401493 is a prime.

It is a super-2 number, since 2×13442401621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13442401621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13442401121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611018245 + ... + 611018266.

It is an arithmetic number, because the mean of its divisors is an integer number (3666109536).

Almost surely, 2^13442401621 is an apocalyptic number.

13442401621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13442401621 is a deficient number, since it is larger than the sum of its proper divisors (1222036523).

13442401621 is a wasteful number, since it uses less digits than its factorization.

13442401621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222036522.

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 13442401621 in words is "thirteen billion, four hundred forty-two million, four hundred one thousand, six hundred twenty-one".