21296497457 has 16 divisors (see below), whose sum is σ = 21795523200. Its totient is φ = 20803305600.

The previous prime is 21296497451. The next prime is 21296497463. The reversal of 21296497457 is 75479469212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21296497451) and next prime (21296497463).

It is a cyclic number.

It is not a de Polignac number, because 21296497457 - 2¹⁸ = 21296235313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21296497451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7171469 + ... + 7174437.

It is an arithmetic number, because the mean of its divisors is an integer number (1362220200).

Almost surely, 2^21296497457 is an apocalyptic number.

It is an amenable number.

21296497457 is a deficient number, since it is larger than the sum of its proper divisors (499025743).

21296497457 is a wasteful number, since it uses less digits than its factorization.

21296497457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3896.

The product of its digits is 7620480, while the sum is 56.

The spelling of 21296497457 in words is "twenty-one billion, two hundred ninety-six million, four hundred ninety-seven thousand, four hundred fifty-seven".