13121388 has 36 divisors (see below), whose sum is σ = 37906960. Its totient is φ = 3748896.

The previous prime is 13121371. The next prime is 13121411. The reversal of 13121388 is 88312131.

13121388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25783 + ... + 26286.

Almost surely, 2^13121388 is an apocalyptic number.

13121388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13121388 is an abundant number, since it is smaller than the sum of its proper divisors (24785572).

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

13121388 is a wasteful number, since it uses less digits than its factorization.

13121388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52086 (or 52081 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 13121388 is about 3622.3456488855. The cubic root of 13121388 is about 235.8630585408.

The spelling of 13121388 in words is "thirteen million, one hundred twenty-one thousand, three hundred eighty-eight".