21323103020 has 24 divisors (see below), whose sum is σ = 47135281200. Its totient is φ = 8080333632.

The previous prime is 21323103017. The next prime is 21323103037. The reversal of 21323103020 is 2030132312.

It is a self number, because there is not a number n which added to its sum of digits gives 21323103020.

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, 28056335 + ... + 28057094.

It is an arithmetic number, because the mean of its divisors is an integer number (1963970050).

Almost surely, 2^21323103020 is an apocalyptic number.

21323103020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323103020 is an abundant number, since it is smaller than the sum of its proper divisors (25812178180).

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

21323103020 is a wasteful number, since it uses less digits than its factorization.

21323103020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56113457 (or 56113455 counting only the distinct ones).

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

Adding to 21323103020 its reverse (2030132312), we get a palindrome (23353235332).

The spelling of 21323103020 in words is "twenty-one billion, three hundred twenty-three million, one hundred three thousand, twenty".