31221102020 has 24 divisors (see below), whose sum is σ = 67089067584. Its totient is φ = 12198011616.

The previous prime is 31221102019. The next prime is 31221102047. The reversal of 31221102020 is 2020112213.

It is a happy number.

It is a super-2 number, since 2×31221102020² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31221101986 and 31221102004.

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, 18150944 + ... + 18152663.

It is an arithmetic number, because the mean of its divisors is an integer number (2795377816).

Almost surely, 2^31221102020 is an apocalyptic number.

It is an amenable number.

31221102020 is an abundant number, since it is smaller than the sum of its proper divisors (35867965564).

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

31221102020 is a wasteful number, since it uses less digits than its factorization.

31221102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36303659 (or 36303657 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31221102020 its reverse (2020112213), we get a palindrome (33241214233).

The spelling of 31221102020 in words is "thirty-one billion, two hundred twenty-one million, one hundred two thousand, twenty".