23121331020 has 72 divisors (see below), whose sum is σ = 70294704480. Its totient is φ = 6151622400.

The previous prime is 23121331001. The next prime is 23121331061. The reversal of 23121331020 is 2013312132.

23121331020 is a `hidden beast` number, since 2 + 312 + 1 + 331 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 23121330984 and 23121331002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67281 + ... + 225320.

It is an arithmetic number, because the mean of its divisors is an integer number (976315340).

Almost surely, 2^23121331020 is an apocalyptic number.

23121331020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23121331020 is an abundant number, since it is smaller than the sum of its proper divisors (47173373460).

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

23121331020 is a wasteful number, since it uses less digits than its factorization.

23121331020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293055 (or 293050 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 23121331020 its reverse (2013312132), we get a palindrome (25134643152).

The spelling of 23121331020 in words is "twenty-three billion, one hundred twenty-one million, three hundred thirty-one thousand, twenty".