21343366400 has 54 divisors (see below), whose sum is σ = 52828182582. Its totient is φ = 8537344000.

The previous prime is 21343366393. The next prime is 21343366411. The reversal of 21343366400 is 466334312.

It can be written as a sum of positive squares in 3 ways, for example, as 7404258304 + 13939108096 = 86048^2 + 118064^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1661051 + ... + 1673850.

Almost surely, 2^21343366400 is an apocalyptic number.

21343366400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21343366400 is an abundant number, since it is smaller than the sum of its proper divisors (31484816182).

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

21343366400 is an equidigital number, since it uses as much as digits as its factorization.

21343366400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334927 (or 3334908 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 32.

The spelling of 21343366400 in words is "twenty-one billion, three hundred forty-three million, three hundred sixty-six thousand, four hundred".