21092798317679 has 16 divisors (see below), whose sum is σ = 23295264781824. Its totient is φ = 18937974652800.

The previous prime is 21092798317601. The next prime is 21092798317751. The reversal of 21092798317679 is 97671389729012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21092798317679 is a prime.

It is a super-2 number, since 2×21092798317679² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21092798317979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1061162 + ... + 6581159.

It is an arithmetic number, because the mean of its divisors is an integer number (1455954048864).

Almost surely, 2^{21092798317679} is an apocalyptic number.

21092798317679 is a deficient number, since it is larger than the sum of its proper divisors (2202466464145).

21092798317679 is a wasteful number, since it uses less digits than its factorization.

21092798317679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7645438.

The product of its (nonzero) digits is 144027072, while the sum is 71.

The spelling of 21092798317679 in words is "twenty-one trillion, ninety-two billion, seven hundred ninety-eight million, three hundred seventeen thousand, six hundred seventy-nine".