21457499271 has 16 divisors (see below), whose sum is σ = 30817290336. Its totient is φ = 13201819776.

The previous prime is 21457499269. The next prime is 21457499303. The reversal of 21457499271 is 17299475412.

It is not a de Polignac number, because 21457499271 - 2¹ = 21457499269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21457494271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136621 + ... + 248153.

It is an arithmetic number, because the mean of its divisors is an integer number (1926080646).

Almost surely, 2^21457499271 is an apocalyptic number.

21457499271 is a deficient number, since it is larger than the sum of its proper divisors (9359791065).

21457499271 is a wasteful number, since it uses less digits than its factorization.

21457499271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116482.

The product of its digits is 1270080, while the sum is 51.

The spelling of 21457499271 in words is "twenty-one billion, four hundred fifty-seven million, four hundred ninety-nine thousand, two hundred seventy-one".