31021424 has 20 divisors (see below), whose sum is σ = 68690544. Its totient is φ = 13294848.

The previous prime is 31021399. The next prime is 31021427. The reversal of 31021424 is 42412013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138377 + ... + 138600.

Almost surely, 2^31021424 is an apocalyptic number.

It is an amenable number.

31021424 is an abundant number, since it is smaller than the sum of its proper divisors (37669120).

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

31021424 is a wasteful number, since it uses less digits than its factorization.

31021424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276992 (or 276986 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 31021424 is about 5569.6879625343. The cubic root of 31021424 is about 314.2104151759.

Adding to 31021424 its reverse (42412013), we get a palindrome (73433437).

The spelling of 31021424 in words is "thirty-one million, twenty-one thousand, four hundred twenty-four".