21423310400 has 42 divisors (see below), whose sum is σ = 52714737090. Its totient is φ = 8569323520.

The previous prime is 21423310379. The next prime is 21423310409. The reversal of 21423310400 is 401332412.

It can be written as a sum of positive squares in 3 ways, for example, as 1679688256 + 19743622144 = 40984^2 + 140512^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21423310409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6693185 + ... + 6696384.

Almost surely, 2^21423310400 is an apocalyptic number.

21423310400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21423310400 is an abundant number, since it is smaller than the sum of its proper divisors (31291426690).

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

21423310400 is a wasteful number, since it uses less digits than its factorization.

21423310400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13389591 (or 13389576 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21423310400 its reverse (401332412), we get a palindrome (21824642812).

The spelling of 21423310400 in words is "twenty-one billion, four hundred twenty-three million, three hundred ten thousand, four hundred".