31154221120 has 112 divisors (see below), whose sum is σ = 81173409408. Its totient is φ = 11294760960.

The previous prime is 31154221117. The next prime is 31154221141. The reversal of 31154221120 is 2112245113.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31154221091 and 31154221100.

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, 1173109 + ... + 1199371.

It is an arithmetic number, because the mean of its divisors is an integer number (724762584).

Almost surely, 2^31154221120 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 31154221120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40586704704).

31154221120 is an abundant number, since it is smaller than the sum of its proper divisors (50019188288).

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

31154221120 is a wasteful number, since it uses less digits than its factorization.

31154221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26628 (or 26618 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 31154221120 its reverse (2112245113), we get a palindrome (33266466233).

The spelling of 31154221120 in words is "thirty-one billion, one hundred fifty-four million, two hundred twenty-one thousand, one hundred twenty".