21303313400 has 48 divisors (see below), whose sum is σ = 49689609840. Its totient is φ = 8493900800.

The previous prime is 21303313387. The next prime is 21303313439. The reversal of 21303313400 is 431330312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109049 + ... + 233448.

It is an arithmetic number, because the mean of its divisors is an integer number (1035200205).

Almost surely, 2^21303313400 is an apocalyptic number.

21303313400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303313400 is an abundant number, since it is smaller than the sum of its proper divisors (28386296440).

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

21303313400 is a wasteful number, since it uses less digits than its factorization.

21303313400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342824 (or 342815 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21303313400 its reverse (431330312), we get a palindrome (21734643712).

The spelling of 21303313400 in words is "twenty-one billion, three hundred three million, three hundred thirteen thousand, four hundred".