21460477278 has 8 divisors (see below), whose sum is σ = 42920954568. Its totient is φ = 7153492424.

The previous prime is 21460477237. The next prime is 21460477279. The reversal of 21460477278 is 87277406412.

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

21460477278 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460477279) 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, 1788373101 + ... + 1788373112.

It is an arithmetic number, because the mean of its divisors is an integer number (5365119321).

Almost surely, 2^21460477278 is an apocalyptic number.

21460477278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21460477278 is a wasteful number, since it uses less digits than its factorization.

21460477278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576746218.

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

The spelling of 21460477278 in words is "twenty-one billion, four hundred sixty million, four hundred seventy-seven thousand, two hundred seventy-eight".