21684645492607 has 8 divisors (see below), whose sum is σ = 21774915448352. Its totient is φ = 21594377952000.

The previous prime is 21684645492599. The next prime is 21684645492673. The reversal of 21684645492607 is 70629454648612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21684645492607 - 2³ = 21684645492599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21684645492677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18668278 + ... + 19795804.

It is an arithmetic number, because the mean of its divisors is an integer number (2721864431044).

Almost surely, 2^{21684645492607} is an apocalyptic number.

21684645492607 is a deficient number, since it is larger than the sum of its proper divisors (90269955745).

21684645492607 is a wasteful number, since it uses less digits than its factorization.

21684645492607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207569.

The product of its (nonzero) digits is 139345920, while the sum is 64.

The spelling of 21684645492607 in words is "twenty-one trillion, six hundred eighty-four billion, six hundred forty-five million, four hundred ninety-two thousand, six hundred seven".