31021123000 has 128 divisors (see below), whose sum is σ = 84320496000. Its totient is φ = 10461312000.

The previous prime is 31021122989. The next prime is 31021123057. The reversal of 31021123000 is 32112013.

It is a super-2 number, since 2×31021123000² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390676 + ... + 463324.

It is an arithmetic number, because the mean of its divisors is an integer number (658753875).

Almost surely, 2^31021123000 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 31021123000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42160248000).

31021123000 is an abundant number, since it is smaller than the sum of its proper divisors (53299373000).

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

31021123000 is a wasteful number, since it uses less digits than its factorization.

31021123000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72738 (or 72724 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31021123000 its reverse (32112013), we get a palindrome (31053235013).

The spelling of 31021123000 in words is "thirty-one billion, twenty-one million, one hundred twenty-three thousand".