31130421 has 16 divisors (see below), whose sum is σ = 47760000. Its totient is φ = 17667648.

The previous prime is 31130419. The next prime is 31130423. The reversal of 31130421 is 12403113.

It is an interprime number because it is at equal distance from previous prime (31130419) and next prime (31130423).

It is not a de Polignac number, because 31130421 - 2¹ = 31130419 is a prime.

It is a super-2 number, since 2×31130421² = 1938206223274482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31130421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130423) 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 15 ways as a sum of consecutive naturals, for example, 1846 + ... + 8103.

It is an arithmetic number, because the mean of its divisors is an integer number (2985000).

Almost surely, 2^31130421 is an apocalyptic number.

It is an amenable number.

31130421 is a deficient number, since it is larger than the sum of its proper divisors (16629579).

31130421 is a wasteful number, since it uses less digits than its factorization.

31130421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10108.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31130421 is about 5579.4642215897. The cubic root of 31130421 is about 314.5779886680.

Adding to 31130421 its reverse (12403113), we get a palindrome (43533534).

The spelling of 31130421 in words is "thirty-one million, one hundred thirty thousand, four hundred twenty-one".