21496615745 has 32 divisors (see below), whose sum is σ = 28268787456. Its totient is φ = 15563116800.

The previous prime is 21496615717. The next prime is 21496615781. The reversal of 21496615745 is 54751669412.

It is not a de Polignac number, because 21496615745 - 2¹⁰ = 21496614721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21496615693 and 21496615702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16833047 + ... + 16834323.

It is an arithmetic number, because the mean of its divisors is an integer number (883399608).

Almost surely, 2^21496615745 is an apocalyptic number.

It is an amenable number.

21496615745 is a deficient number, since it is larger than the sum of its proper divisors (6772171711).

21496615745 is a wasteful number, since it uses less digits than its factorization.

21496615745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441.

The product of its digits is 1814400, while the sum is 50.

The spelling of 21496615745 in words is "twenty-one billion, four hundred ninety-six million, six hundred fifteen thousand, seven hundred forty-five".