31000221024 has 48 divisors (see below), whose sum is σ = 81384755760. Its totient is φ = 10332241920.

The previous prime is 31000221013. The next prime is 31000221029. The reversal of 31000221024 is 42012200013.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×31000221024² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000220994 and 31000221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000221029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457184 + ... + 1478304.

It is an arithmetic number, because the mean of its divisors is an integer number (1695515745).

Almost surely, 2^31000221024 is an apocalyptic number.

It is an amenable number.

31000221024 is an abundant number, since it is smaller than the sum of its proper divisors (50384534736).

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

31000221024 is a wasteful number, since it uses less digits than its factorization.

31000221024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36423 (or 36415 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 31000221024 its reverse (42012200013), we get a palindrome (73012421037).

The spelling of 31000221024 in words is "thirty-one billion, two hundred twenty-one thousand, twenty-four".