21782316057 has 16 divisors (see below), whose sum is σ = 29120729088. Its totient is φ = 14482757520.

The previous prime is 21782316007. The next prime is 21782316071. The reversal of 21782316057 is 75061328712.

It is not a de Polignac number, because 21782316057 - 2¹² = 21782311961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21782316007) 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, 4641082 + ... + 4645772.

It is an arithmetic number, because the mean of its divisors is an integer number (1820045568).

Almost surely, 2^21782316057 is an apocalyptic number.

It is an amenable number.

21782316057 is a deficient number, since it is larger than the sum of its proper divisors (7338413031).

21782316057 is a wasteful number, since it uses less digits than its factorization.

21782316057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500.

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 21782316057 in words is "twenty-one billion, seven hundred eighty-two million, three hundred sixteen thousand, fifty-seven".