21470784635 has 16 divisors (see below), whose sum is σ = 26450952192. Its totient is φ = 16723116000.

The previous prime is 21470784623. The next prime is 21470784653. The reversal of 21470784635 is 53648707412.

It is not a de Polignac number, because 21470784635 - 2⁶ = 21470784571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21470784635.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194291 + ... + 284060.

It is an arithmetic number, because the mean of its divisors is an integer number (1653184512).

Almost surely, 2^21470784635 is an apocalyptic number.

21470784635 is a deficient number, since it is larger than the sum of its proper divisors (4980167557).

21470784635 is a wasteful number, since it uses less digits than its factorization.

21470784635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478594.

The product of its (nonzero) digits is 1128960, while the sum is 47.

The spelling of 21470784635 in words is "twenty-one billion, four hundred seventy million, seven hundred eighty-four thousand, six hundred thirty-five".