21477430730564 has 6 divisors (see below), whose sum is σ = 37585503778494. Its totient is φ = 10738715365280.

The previous prime is 21477430730549. The next prime is 21477430730621. The reversal of 21477430730564 is 46503703477412.

It can be written as a sum of positive squares in only one way, i.e., 14551112126464 + 6926318604100 = 3814592^2 + 2631790^2 .

It is a super-2 number, since 2×21477430730564² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2684678841317 + ... + 2684678841324.

It is an arithmetic number, because the mean of its divisors is an integer number (6264250629749).

Almost surely, 2^{21477430730564} is an apocalyptic number.

It is an amenable number.

21477430730564 is a deficient number, since it is larger than the sum of its proper divisors (16108073047930).

21477430730564 is a wasteful number, since it uses less digits than its factorization.

21477430730564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369357682645 (or 5369357682643 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 53.

The spelling of 21477430730564 in words is "twenty-one trillion, four hundred seventy-seven billion, four hundred thirty million, seven hundred thirty thousand, five hundred sixty-four".