21231322120 has 32 divisors (see below), whose sum is σ = 47797427520. Its totient is φ = 8487737280.

The previous prime is 21231322087. The next prime is 21231322157. The reversal of 21231322120 is 2122313212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77526 + ... + 220165.

It is an arithmetic number, because the mean of its divisors is an integer number (1493669610).

Almost surely, 2^21231322120 is an apocalyptic number.

21231322120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231322120 is an abundant number, since it is smaller than the sum of its proper divisors (26566105400).

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

21231322120 is a wasteful number, since it uses less digits than its factorization.

21231322120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299485 (or 299481 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21231322120 its reverse (2122313212), we get a palindrome (23353635332).

The spelling of 21231322120 in words is "twenty-one billion, two hundred thirty-one million, three hundred twenty-two thousand, one hundred twenty".