21675013447 has 16 divisors (see below), whose sum is σ = 24024978432. Its totient is φ = 19450203520.

The previous prime is 21675013387. The next prime is 21675013469. The reversal of 21675013447 is 74431057612.

It is a cyclic number.

It is not a de Polignac number, because 21675013447 - 2⁷ = 21675013319 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 (21675013747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32478 + ... + 210724.

It is an arithmetic number, because the mean of its divisors is an integer number (1501561152).

Almost surely, 2^21675013447 is an apocalyptic number.

21675013447 is a deficient number, since it is larger than the sum of its proper divisors (2349964985).

21675013447 is a wasteful number, since it uses less digits than its factorization.

21675013447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178598.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 21675013447 in words is "twenty-one billion, six hundred seventy-five million, thirteen thousand, four hundred forty-seven".