21165001701372 has 36 divisors (see below), whose sum is σ = 54805309287456. Its totient is φ = 6882927382080.

The previous prime is 21165001701329. The next prime is 21165001701401. The reversal of 21165001701372 is 27310710056112.

21165001701372 is a `hidden beast` number, since 2 + 1 + 1 + 6 + 500 + 1 + 70 + 13 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7169714548 + ... + 7169717499.

Almost surely, 2^{21165001701372} is an apocalyptic number.

It is an amenable number.

21165001701372 is an abundant number, since it is smaller than the sum of its proper divisors (33640307586084).

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

21165001701372 is a wasteful number, since it uses less digits than its factorization.

21165001701372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14339432098 (or 14339432093 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

Adding to 21165001701372 its reverse (27310710056112), we get a palindrome (48475711757484).

The spelling of 21165001701372 in words is "twenty-one trillion, one hundred sixty-five billion, one million, seven hundred one thousand, three hundred seventy-two".