137331421 has 4 divisors (see below), whose sum is σ = 137359744. Its totient is φ = 137303100.

The previous prime is 137331419. The next prime is 137331437. The reversal of 137331421 is 124133731.

137331421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124133731 = 2081 ⋅59651.

It is a cyclic number.

It is not a de Polignac number, because 137331421 - 2¹ = 137331419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137331401) 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, 4845 + ... + 17266.

It is an arithmetic number, because the mean of its divisors is an integer number (34339936).

Almost surely, 2^137331421 is an apocalyptic number.

It is an amenable number.

137331421 is a deficient number, since it is larger than the sum of its proper divisors (28323).

137331421 is an equidigital number, since it uses as much as digits as its factorization.

137331421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28322.

The product of its digits is 1512, while the sum is 25.

The square root of 137331421 is about 11718.8489622488. The cubic root of 137331421 is about 515.9290372237.

The spelling of 137331421 in words is "one hundred thirty-seven million, three hundred thirty-one thousand, four hundred twenty-one".