21798179045 has 8 divisors (see below), whose sum is σ = 27295111296. Its totient is φ = 16680345616.

The previous prime is 21798179009. The next prime is 21798179057. The reversal of 21798179045 is 54097189712.

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 21798179045 - 2¹⁰ = 21798178021 is a prime.

It is a super-2 number, since 2×21798179045² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94774577 + ... + 94774806.

It is an arithmetic number, because the mean of its divisors is an integer number (3411888912).

Almost surely, 2^21798179045 is an apocalyptic number.

It is an amenable number.

21798179045 is a deficient number, since it is larger than the sum of its proper divisors (5496932251).

21798179045 is a wasteful number, since it uses less digits than its factorization.

21798179045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189549411.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 21798179045 in words is "twenty-one billion, seven hundred ninety-eight million, one hundred seventy-nine thousand, forty-five".