21318901422336 has 1800 divisors, whose sum is σ = 77710431484224. Its totient is φ = 5807171543040.

The previous prime is 21318901422323. The next prime is 21318901422347. The reversal of 21318901422336 is 63322410981312.

It is a happy number.

21318901422336 is a `hidden beast` number, since 2 + 1 + 318 + 90 + 14 + 2 + 233 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21318901422291 and 21318901422300.

It is an unprimeable number.

It is a polite number, since it can be written in 199 ways as a sum of consecutive naturals, for example, 130790806191 + ... + 130790806353.

Almost surely, 2^{21318901422336} 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 21318901422336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38855215742112).

21318901422336 is an abundant number, since it is smaller than the sum of its proper divisors (56391530061888).

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

21318901422336 is an frugal number, since it uses more digits than its factorization.

21318901422336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 21318901422336 in words is "twenty-one trillion, three hundred eighteen billion, nine hundred one million, four hundred twenty-two thousand, three hundred thirty-six".