31967421 has 4 divisors (see below), whose sum is σ = 42623232. Its totient is φ = 21311612.

The previous prime is 31967399. The next prime is 31967461. The reversal of 31967421 is 12476913.

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: 12476913 = 3 ⋅4158971.

It is a cyclic number.

It is not a de Polignac number, because 31967421 - 2¹³ = 31959229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31967461) 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, 5327901 + ... + 5327906.

It is an arithmetic number, because the mean of its divisors is an integer number (10655808).

Almost surely, 2^31967421 is an apocalyptic number.

It is an amenable number.

31967421 is a deficient number, since it is larger than the sum of its proper divisors (10655811).

31967421 is a wasteful number, since it uses less digits than its factorization.

31967421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655810.

The product of its digits is 9072, while the sum is 33.

The square root of 31967421 is about 5653.9739122143. The cubic root of 31967421 is about 317.3724322700.

The spelling of 31967421 in words is "thirty-one million, nine hundred sixty-seven thousand, four hundred twenty-one".