21421879223 has 8 divisors (see below), whose sum is σ = 21478735296. Its totient is φ = 21365100000.

The previous prime is 21421879217. The next prime is 21421879243. The reversal of 21421879223 is 32297812412.

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 21421879223 - 2²⁸ = 21153443767 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 (21421879243) 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, 562073 + ... + 598973.

It is an arithmetic number, because the mean of its divisors is an integer number (2684841912).

Almost surely, 2^21421879223 is an apocalyptic number.

21421879223 is a deficient number, since it is larger than the sum of its proper divisors (56856073).

21421879223 is an equidigital number, since it uses as much as digits as its factorization.

21421879223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38425.

The product of its digits is 96768, while the sum is 41.

The spelling of 21421879223 in words is "twenty-one billion, four hundred twenty-one million, eight hundred seventy-nine thousand, two hundred twenty-three".