21323053220 has 24 divisors (see below), whose sum is σ = 51175328064. Its totient is φ = 7310761056.

The previous prime is 21323053217. The next prime is 21323053249. The reversal of 21323053220 is 2235032312.

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, 76153622 + ... + 76153901.

It is an arithmetic number, because the mean of its divisors is an integer number (2132305336).

Almost surely, 2^21323053220 is an apocalyptic number.

21323053220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323053220 is an abundant number, since it is smaller than the sum of its proper divisors (29852274844).

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

21323053220 is a wasteful number, since it uses less digits than its factorization.

21323053220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152307539 (or 152307537 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 21323053220 its reverse (2235032312), we get a palindrome (23558085532).

The spelling of 21323053220 in words is "twenty-one billion, three hundred twenty-three million, fifty-three thousand, two hundred twenty".