31402232120 has 192 divisors, whose sum is σ = 86609502720. Its totient is φ = 10196879616.

The previous prime is 31402232053. The next prime is 31402232131. The reversal of 31402232120 is 2123220413.

It is a super-2 number, since 2×31402232120² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 31402232092 and 31402232101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4639859 + ... + 4646621.

It is an arithmetic number, because the mean of its divisors is an integer number (451091160).

Almost surely, 2^31402232120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31402232120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43304751360).

31402232120 is an abundant number, since it is smaller than the sum of its proper divisors (55207270600).

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

31402232120 is a wasteful number, since it uses less digits than its factorization.

31402232120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6914 (or 6903 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31402232120 its reverse (2123220413), we get a palindrome (33525452533).

The spelling of 31402232120 in words is "thirty-one billion, four hundred two million, two hundred thirty-two thousand, one hundred twenty".