21230313020 has 24 divisors (see below), whose sum is σ = 50952751584. Its totient is φ = 7278964416.

The previous prime is 21230312993. The next prime is 21230313029. The reversal of 21230313020 is 2031303212.

It is a self number, because there is not a number n which added to its sum of digits gives 21230313020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230313029) 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, 75822407 + ... + 75822686.

It is an arithmetic number, because the mean of its divisors is an integer number (2123031316).

Almost surely, 2^21230313020 is an apocalyptic number.

21230313020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230313020 is an abundant number, since it is smaller than the sum of its proper divisors (29722438564).

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

21230313020 is a wasteful number, since it uses less digits than its factorization.

21230313020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151645109 (or 151645107 counting only the distinct ones).

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

Adding to 21230313020 its reverse (2031303212), we get a palindrome (23261616232).

The spelling of 21230313020 in words is "twenty-one billion, two hundred thirty million, three hundred thirteen thousand, twenty".