21475684223 has 8 divisors (see below), whose sum is σ = 25610754048. Its totient is φ = 17607393144.

The previous prime is 21475684207. The next prime is 21475684229. The reversal of 21475684223 is 32248657412.

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 21475684223 - 2⁴ = 21475684207 is a prime.

It is a super-2 number, since 2×21475684223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475684229) 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, 66694511 + ... + 66694832.

It is an arithmetic number, because the mean of its divisors is an integer number (3201344256).

Almost surely, 2^21475684223 is an apocalyptic number.

21475684223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21475684223 is a deficient number, since it is larger than the sum of its proper divisors (4135069825).

21475684223 is a wasteful number, since it uses less digits than its factorization.

21475684223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133389373.

The product of its digits is 645120, while the sum is 44.

The spelling of 21475684223 in words is "twenty-one billion, four hundred seventy-five million, six hundred eighty-four thousand, two hundred twenty-three".