21231303020 has 24 divisors (see below), whose sum is σ = 44593567200. Its totient is φ = 8491029632.

The previous prime is 21231302977. The next prime is 21231303029. The reversal of 21231303020 is 2030313212.

It is a super-2 number, since 2×21231303020² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21231303020.

It is not an unprimeable number, because it can be changed into a prime (21231303029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27296 + ... + 207864.

It is an arithmetic number, because the mean of its divisors is an integer number (1858065300).

Almost surely, 2^21231303020 is an apocalyptic number.

21231303020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231303020 is an abundant number, since it is smaller than the sum of its proper divisors (23362264180).

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

21231303020 is a wasteful number, since it uses less digits than its factorization.

21231303020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186457 (or 186455 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21231303020 its reverse (2030313212), we get a palindrome (23261616232).

The spelling of 21231303020 in words is "twenty-one billion, two hundred thirty-one million, three hundred three thousand, twenty".