21493162079 has 4 divisors (see below), whose sum is σ = 22186489920. Its totient is φ = 20799834240.

The previous prime is 21493162069. The next prime is 21493162091. The reversal of 21493162079 is 97026139412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21493162079 - 2¹⁶ = 21493096543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21493162069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346663874 + ... + 346663935.

It is an arithmetic number, because the mean of its divisors is an integer number (5546622480).

Almost surely, 2^21493162079 is an apocalyptic number.

21493162079 is a deficient number, since it is larger than the sum of its proper divisors (693327841).

21493162079 is an equidigital number, since it uses as much as digits as its factorization.

21493162079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693327840.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 21493162079 in words is "twenty-one billion, four hundred ninety-three million, one hundred sixty-two thousand, seventy-nine".