21474054464 has 14 divisors (see below), whose sum is σ = 42612576954. Its totient is φ = 10737027200.

The previous prime is 21474054463. The next prime is 21474054491. The reversal of 21474054464 is 46445047412.

It can be written as a sum of positive squares in only one way, i.e., 12144040000 + 9330014464 = 110200^2 + 96592^2 .

It is a super-2 number, since 2×21474054464² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474054463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167765987 + ... + 167766114.

Almost surely, 2^21474054464 is an apocalyptic number.

It is an amenable number.

21474054464 is a deficient number, since it is larger than the sum of its proper divisors (21138522490).

21474054464 is an equidigital number, since it uses as much as digits as its factorization.

21474054464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335532113 (or 335532103 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 41.

The spelling of 21474054464 in words is "twenty-one billion, four hundred seventy-four million, fifty-four thousand, four hundred sixty-four".