21430891485 has 24 divisors (see below), whose sum is σ = 37150283040. Its totient is φ = 11428761312.

The previous prime is 21430891477. The next prime is 21430891513. The reversal of 21430891485 is 58419803412.

21430891485 is a `hidden beast` number, since 214 + 308 + 91 + 48 + 5 = 666.

It is not a de Polignac number, because 21430891485 - 2³ = 21430891477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21430891485.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 969486 + ... + 991344.

It is an arithmetic number, because the mean of its divisors is an integer number (1547928460).

Almost surely, 2^21430891485 is an apocalyptic number.

It is an amenable number.

21430891485 is a deficient number, since it is larger than the sum of its proper divisors (15719391555).

21430891485 is a wasteful number, since it uses less digits than its factorization.

21430891485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43657 (or 43654 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 21430891485 in words is "twenty-one billion, four hundred thirty million, eight hundred ninety-one thousand, four hundred eighty-five".