31012201020 has 24 divisors (see below), whose sum is σ = 86834163024. Its totient is φ = 8269920256.

The previous prime is 31012201013. The next prime is 31012201039. The reversal of 31012201020 is 2010221013.

It is a super-2 number, since 2×31012201020² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31012200987 and 31012201005.

It is a congruent number.

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, 258434949 + ... + 258435068.

It is an arithmetic number, because the mean of its divisors is an integer number (3618090126).

Almost surely, 2^31012201020 is an apocalyptic number.

31012201020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31012201020 is an abundant number, since it is smaller than the sum of its proper divisors (55821962004).

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

31012201020 is a wasteful number, since it uses less digits than its factorization.

31012201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516870029 (or 516870027 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 31012201020 its reverse (2010221013), we get a palindrome (33022422033).

The spelling of 31012201020 in words is "thirty-one billion, twelve million, two hundred one thousand, twenty".