31121011110 has 128 divisors (see below), whose sum is σ = 86911294464. Its totient is φ = 6984552960.

The previous prime is 31121011099. The next prime is 31121011127. The reversal of 31121011110 is 1111012113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8747452 + ... + 8751008.

It is an arithmetic number, because the mean of its divisors is an integer number (678994488).

Almost surely, 2^31121011110 is an apocalyptic number.

31121011110 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31121011110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43455647232).

31121011110 is an abundant number, since it is smaller than the sum of its proper divisors (55790283354).

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

31121011110 is a wasteful number, since it uses less digits than its factorization.

31121011110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 31121011110 its reverse (1111012113), we get a palindrome (32232023223).

The spelling of 31121011110 in words is "thirty-one billion, one hundred twenty-one million, eleven thousand, one hundred ten".