21023230213020 has 96 divisors (see below), whose sum is σ = 67275296524800. Its totient is φ = 4805241202944.

The previous prime is 21023230212973. The next prime is 21023230213049. The reversal of 21023230213020 is 2031203232012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32769486 + ... + 33404874.

It is an arithmetic number, because the mean of its divisors is an integer number (700784338800).

Almost surely, 2^{21023230213020} is an apocalyptic number.

21023230213020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023230213020 is an abundant number, since it is smaller than the sum of its proper divisors (46252066311780).

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

21023230213020 is a wasteful number, since it uses less digits than its factorization.

21023230213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714187 (or 714185 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21023230213020 its reverse (2031203232012), we get a palindrome (23054433445032).

The spelling of 21023230213020 in words is "twenty-one trillion, twenty-three billion, two hundred thirty million, two hundred thirteen thousand, twenty".