21472358765585 has 128 divisors (see below), whose sum is σ = 33892909940736. Its totient is φ = 12686229642240.

The previous prime is 21472358765581. The next prime is 21472358765623. The reversal of 21472358765585 is 58556785327412.

It is not a de Polignac number, because 21472358765585 - 2² = 21472358765581 is a prime.

It is a super-2 number, since 2×21472358765585² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21472358765581) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 496322855 + ... + 496366115.

It is an arithmetic number, because the mean of its divisors is an integer number (264788358912).

Almost surely, 2^{21472358765585} is an apocalyptic number.

It is an amenable number.

21472358765585 is a deficient number, since it is larger than the sum of its proper divisors (12420551175151).

21472358765585 is a wasteful number, since it uses less digits than its factorization.

21472358765585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44455.

The product of its digits is 564480000, while the sum is 68.

The spelling of 21472358765585 in words is "twenty-one trillion, four hundred seventy-two billion, three hundred fifty-eight million, seven hundred sixty-five thousand, five hundred eighty-five".