31122042140 has 48 divisors (see below), whose sum is σ = 74702948544. Its totient is φ = 10668979200.

The previous prime is 31122042059. The next prime is 31122042151. The reversal of 31122042140 is 4124022113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1929710 + ... + 1945770.

It is an arithmetic number, because the mean of its divisors is an integer number (1556311428).

Almost surely, 2^31122042140 is an apocalyptic number.

It is an amenable number.

31122042140 is an abundant number, since it is smaller than the sum of its proper divisors (43580906404).

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

31122042140 is a wasteful number, since it uses less digits than its factorization.

31122042140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29918 (or 29916 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31122042140 its reverse (4124022113), we get a palindrome (35246064253).

The spelling of 31122042140 in words is "thirty-one billion, one hundred twenty-two million, forty-two thousand, one hundred forty".