31021243421 has 32 divisors (see below), whose sum is σ = 36954144000. Its totient is φ = 25478369280.

The previous prime is 31021243369. The next prime is 31021243427. The reversal of 31021243421 is 12434212013.

It is a de Polignac number, because none of the positive numbers 2^k-31021243421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021243427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19231211 + ... + 19232823.

It is an arithmetic number, because the mean of its divisors is an integer number (1154817000).

Almost surely, 2^31021243421 is an apocalyptic number.

It is an amenable number.

31021243421 is a deficient number, since it is larger than the sum of its proper divisors (5932900579).

31021243421 is a wasteful number, since it uses less digits than its factorization.

31021243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31021243421 its reverse (12434212013), we get a palindrome (43455455434).

The spelling of 31021243421 in words is "thirty-one billion, twenty-one million, two hundred forty-three thousand, four hundred twenty-one".