21381175064788 has 48 divisors (see below), whose sum is σ = 47130762720384. Its totient is φ = 8244448266240.

The previous prime is 21381175064747. The next prime is 21381175064813. The reversal of 21381175064788 is 88746057118312.

It is a happy number.

It is a super-2 number, since 2×21381175064788² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357802081 + ... + 357861832.

It is an arithmetic number, because the mean of its divisors is an integer number (981890890008).

Almost surely, 2^{21381175064788} is an apocalyptic number.

21381175064788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21381175064788 is an abundant number, since it is smaller than the sum of its proper divisors (25749587655596).

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

21381175064788 is a wasteful number, since it uses less digits than its factorization.

21381175064788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715664032 (or 715664030 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 61.

The spelling of 21381175064788 in words is "twenty-one trillion, three hundred eighty-one billion, one hundred seventy-five million, sixty-four thousand, seven hundred eighty-eight".