31021414220 has 24 divisors (see below), whose sum is σ = 67977360864. Its totient is φ = 11869062656.

The previous prime is 31021414181. The next prime is 31021414253. The reversal of 31021414220 is 2241412013.

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

It is a junction number, because it is equal to n+sod(n) for n = 31021414192 and 31021414201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33718469 + ... + 33719388.

It is an arithmetic number, because the mean of its divisors is an integer number (2832390036).

Almost surely, 2^31021414220 is an apocalyptic number.

It is an amenable number.

31021414220 is an abundant number, since it is smaller than the sum of its proper divisors (36955946644).

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

31021414220 is a wasteful number, since it uses less digits than its factorization.

31021414220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67437889 (or 67437887 counting only the distinct ones).

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

Adding to 31021414220 its reverse (2241412013), we get a palindrome (33262826233).

The spelling of 31021414220 in words is "thirty-one billion, twenty-one million, four hundred fourteen thousand, two hundred twenty".