31021140220 has 48 divisors (see below), whose sum is σ = 76034810880. Its totient is φ = 10409523264.

The previous prime is 31021140217. The next prime is 31021140247. The reversal of 31021140220 is 2204112013.

It is a super-2 number, since 2×31021140220² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31021140194 and 31021140203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2350650 + ... + 2363809.

It is an arithmetic number, because the mean of its divisors is an integer number (1584058560).

Almost surely, 2^31021140220 is an apocalyptic number.

It is an amenable number.

31021140220 is an abundant number, since it is smaller than the sum of its proper divisors (45013670660).

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

31021140220 is a wasteful number, since it uses less digits than its factorization.

31021140220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4714522 (or 4714520 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31021140220 its reverse (2204112013), we get a palindrome (33225252233).

The spelling of 31021140220 in words is "thirty-one billion, twenty-one million, one hundred forty thousand, two hundred twenty".