21779331157 has 8 divisors (see below), whose sum is σ = 22018456800. Its totient is φ = 21540864624.

The previous prime is 21779331137. The next prime is 21779331173. The reversal of 21779331157 is 75113397712.

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 21779331157 - 2¹⁵ = 21779298389 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 (21779331137) 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, 98182 + ... + 230647.

It is an arithmetic number, because the mean of its divisors is an integer number (2752307100).

Almost surely, 2^21779331157 is an apocalyptic number.

It is an amenable number.

21779331157 is a deficient number, since it is larger than the sum of its proper divisors (239125643).

21779331157 is a wasteful number, since it uses less digits than its factorization.

21779331157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329555.

The product of its digits is 277830, while the sum is 46.

The spelling of 21779331157 in words is "twenty-one billion, seven hundred seventy-nine million, three hundred thirty-one thousand, one hundred fifty-seven".