21460477287 has 4 divisors (see below), whose sum is σ = 28613969720. Its totient is φ = 14306984856.

The previous prime is 21460477279. The next prime is 21460477327. The reversal of 21460477287 is 78277406412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21460477287 - 2³ = 21460477279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460477237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576746212 + ... + 3576746217.

It is an arithmetic number, because the mean of its divisors is an integer number (7153492430).

Almost surely, 2^21460477287 is an apocalyptic number.

21460477287 is a deficient number, since it is larger than the sum of its proper divisors (7153492433).

21460477287 is an equidigital number, since it uses as much as digits as its factorization.

21460477287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7153492432.

The product of its (nonzero) digits is 1053696, while the sum is 48.

The spelling of 21460477287 in words is "twenty-one billion, four hundred sixty million, four hundred seventy-seven thousand, two hundred eighty-seven".