31210421240 has 32 divisors (see below), whose sum is σ = 70947409680. Its totient is φ = 12355464192.

The previous prime is 31210421239. The next prime is 31210421257. The reversal of 31210421240 is 4212401213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4018082 + ... + 4025841.

Almost surely, 2^31210421240 is an apocalyptic number.

It is an amenable number.

31210421240 is an abundant number, since it is smaller than the sum of its proper divisors (39736988440).

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

31210421240 is a wasteful number, since it uses less digits than its factorization.

31210421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8044031 (or 8044027 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31210421240 its reverse (4212401213), we get a palindrome (35422822453).

The spelling of 31210421240 in words is "thirty-one billion, two hundred ten million, four hundred twenty-one thousand, two hundred forty".