31363421 has 4 divisors (see below), whose sum is σ = 32727072. Its totient is φ = 29999772.

The previous prime is 31363411. The next prime is 31363447. The reversal of 31363421 is 12436313.

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: 12436313 = 1531 ⋅8123.

It is a cyclic number.

It is not a de Polignac number, because 31363421 - 2²² = 27169117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 1363627 = 31363421 / (3 + 1 + 3 + 6 + 3 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31363411) 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, 681791 + ... + 681836.

It is an arithmetic number, because the mean of its divisors is an integer number (8181768).

Almost surely, 2^31363421 is an apocalyptic number.

It is an amenable number.

31363421 is a deficient number, since it is larger than the sum of its proper divisors (1363651).

31363421 is a wasteful number, since it uses less digits than its factorization.

31363421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363650.

The product of its digits is 1296, while the sum is 23.

The square root of 31363421 is about 5600.3054380989. The cubic root of 31363421 is about 315.3608730537.

Adding to 31363421 its reverse (12436313), we get a palindrome (43799734).

The spelling of 31363421 in words is "thirty-one million, three hundred sixty-three thousand, four hundred twenty-one".