21460477281 has 8 divisors (see below), whose sum is σ = 29279411040. Its totient is φ = 13974264192.

The previous prime is 21460477279. The next prime is 21460477327. The reversal of 21460477281 is 18277406412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21460477281 - 2¹ = 21460477279 is a prime.

It is a super-2 number, since 2×21460477281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21460077281) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 83180016 + ... + 83180273.

It is an arithmetic number, because the mean of its divisors is an integer number (3659926380).

Almost surely, 2^21460477281 is an apocalyptic number.

It is an amenable number.

21460477281 is a deficient number, since it is larger than the sum of its proper divisors (7818933759).

21460477281 is a wasteful number, since it uses less digits than its factorization.

21460477281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166360335.

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 21460477281 in words is "twenty-one billion, four hundred sixty million, four hundred seventy-seven thousand, two hundred eighty-one".