21484435257 has 12 divisors (see below), whose sum is σ = 31172237824. Its totient is φ = 14258727000.

The previous prime is 21484435243. The next prime is 21484435303. The reversal of 21484435257 is 75253448412.

21484435257 is a `hidden beast` number, since 2 + 1 + 4 + 84 + 43 + 525 + 7 = 666.

It is not a de Polignac number, because 21484435257 - 2⁸ = 21484435001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21484435957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5350369 + ... + 5354382.

Almost surely, 2^21484435257 is an apocalyptic number.

It is an amenable number.

21484435257 is a deficient number, since it is larger than the sum of its proper divisors (9687802567).

21484435257 is a wasteful number, since it uses less digits than its factorization.

21484435257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10704980 (or 10704977 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 45.

The spelling of 21484435257 in words is "twenty-one billion, four hundred eighty-four million, four hundred thirty-five thousand, two hundred fifty-seven".