21705816058 has 16 divisors (see below), whose sum is σ = 33313213440. Its totient is φ = 10604190816.

The previous prime is 21705816029. The next prime is 21705816091. The reversal of 21705816058 is 85061850712.

It is a super-2 number, since 2×21705816058² (a number of 21 digits) contains 22 as substring.

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, 679098 + ... + 710341.

It is an arithmetic number, because the mean of its divisors is an integer number (2082075840).

Almost surely, 2^21705816058 is an apocalyptic number.

21705816058 is a deficient number, since it is larger than the sum of its proper divisors (11607397382).

21705816058 is a wasteful number, since it uses less digits than its factorization.

21705816058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389621.

The product of its (nonzero) digits is 134400, while the sum is 43.

The spelling of 21705816058 in words is "twenty-one billion, seven hundred five million, eight hundred sixteen thousand, fifty-eight".