31101121220 has 48 divisors (see below), whose sum is σ = 70349260800. Its totient is φ = 11481388416.

The previous prime is 31101121211. The next prime is 31101121243. The reversal of 31101121220 is 2212110113.

It is a super-2 number, since 2×31101121220² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31101121195 and 31101121204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2697989 + ... + 2709491.

It is an arithmetic number, because the mean of its divisors is an integer number (1465609600).

Almost surely, 2^31101121220 is an apocalyptic number.

It is an amenable number.

31101121220 is an abundant number, since it is smaller than the sum of its proper divisors (39248139580).

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

31101121220 is a wasteful number, since it uses less digits than its factorization.

31101121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21924 (or 21922 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31101121220 its reverse (2212110113), we get a palindrome (33313231333).

The spelling of 31101121220 in words is "thirty-one billion, one hundred one million, one hundred twenty-one thousand, two hundred twenty".