21336400404 has 96 divisors (see below), whose sum is σ = 61023715200. Its totient is φ = 6392897280.

The previous prime is 21336400399. The next prime is 21336400433. The reversal of 21336400404 is 40400463312.

21336400404 is a `hidden beast` number, since 2 + 13 + 3 + 640 + 0 + 4 + 0 + 4 = 666.

It is a super-2 number, since 2×21336400404² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 4834 + ... + 206630.

It is an arithmetic number, because the mean of its divisors is an integer number (635663700).

Almost surely, 2^21336400404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21336400404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30511857600).

21336400404 is an abundant number, since it is smaller than the sum of its proper divisors (39687314796).

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

21336400404 is a wasteful number, since it uses less digits than its factorization.

21336400404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201910 (or 201902 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21336400404 its reverse (40400463312), we get a palindrome (61736863716).

The spelling of 21336400404 in words is "twenty-one billion, three hundred thirty-six million, four hundred thousand, four hundred four".