31121101010 has 32 divisors (see below), whose sum is σ = 56155241520. Its totient is φ = 12417979392.

The previous prime is 31121100991. The next prime is 31121101019. The reversal of 31121101010 is 1010112113.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 30837818449 + 283282561 = 175607^2 + 16831^2 .

It is a super-3 number, since 3×31121101010³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31121100982 and 31121101000.

It is not an unprimeable number, because it can be changed into a prime (31121101019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10891502 + ... + 10894358.

Almost surely, 2^31121101010 is an apocalyptic number.

31121101010 is a deficient number, since it is larger than the sum of its proper divisors (25034140510).

31121101010 is a wasteful number, since it uses less digits than its factorization.

31121101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5150.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 31121101010 its reverse (1010112113), we get a palindrome (32131213123).

The spelling of 31121101010 in words is "thirty-one billion, one hundred twenty-one million, one hundred one thousand, ten".