31233421 has 2 divisors, whose sum is σ = 31233422. Its totient is φ = 31233420.

The previous prime is 31233409. The next prime is 31233443. The reversal of 31233421 is 12433213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30969225 + 264196 = 5565^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 31233421 - 2²¹ = 29136269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31233401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616710 + 15616711.

It is an arithmetic number, because the mean of its divisors is an integer number (15616711).

Almost surely, 2^31233421 is an apocalyptic number.

It is an amenable number.

31233421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31233421 is an equidigital number, since it uses as much as digits as its factorization.

31233421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 31233421 is about 5588.6868761812. The cubic root of 31233421 is about 314.9245506708.

Adding to 31233421 its reverse (12433213), we get a palindrome (43666634).

It can be divided in two parts, 312 and 33421, that added together give a palindrome (33733).

The spelling of 31233421 in words is "thirty-one million, two hundred thirty-three thousand, four hundred twenty-one".