21169902801739 has 8 divisors (see below), whose sum is σ = 21200592024000. Its totient is φ = 21139217041152.

The previous prime is 21169902801713. The next prime is 21169902801757. The reversal of 21169902801739 is 93710820996112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21169902801739 - 2⁹ = 21169902801227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21169902801709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11502427 + ... + 13215355.

It is an arithmetic number, because the mean of its divisors is an integer number (2650074003000).

Almost surely, 2^{21169902801739} is an apocalyptic number.

21169902801739 is a deficient number, since it is larger than the sum of its proper divisors (30689222261).

21169902801739 is a wasteful number, since it uses less digits than its factorization.

21169902801739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730837.

The product of its (nonzero) digits is 2939328, while the sum is 58.

The spelling of 21169902801739 in words is "twenty-one trillion, one hundred sixty-nine billion, nine hundred two million, eight hundred one thousand, seven hundred thirty-nine".