31253421 has 8 divisors (see below), whose sum is σ = 42377760. Its totient is φ = 20482352.

The previous prime is 31253413. The next prime is 31253437. The reversal of 31253421 is 12435213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31253421 - 2³ = 31253413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31253441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88110 + ... + 88463.

It is an arithmetic number, because the mean of its divisors is an integer number (5297220).

Almost surely, 2^31253421 is an apocalyptic number.

It is an amenable number.

31253421 is a deficient number, since it is larger than the sum of its proper divisors (11124339).

31253421 is a wasteful number, since it uses less digits than its factorization.

31253421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176635.

The product of its digits is 720, while the sum is 21.

The square root of 31253421 is about 5590.4759189178. The cubic root of 31253421 is about 314.9917558941.

Adding to 31253421 its reverse (12435213), we get a palindrome (43688634).

The spelling of 31253421 in words is "thirty-one million, two hundred fifty-three thousand, four hundred twenty-one".