21365414021 has 8 divisors (see below), whose sum is σ = 24471049920. Its totient is φ = 18273136608.

The previous prime is 21365413997. The next prime is 21365414023. The reversal of 21365414021 is 12041456312.

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 21365414021 - 2¹⁴ = 21365397637 is a prime.

It is a super-3 number, since 3×21365414021³ (a number of 32 digits) contains 333 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 (21365414023) 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, 3336191 + ... + 3342588.

It is an arithmetic number, because the mean of its divisors is an integer number (3058881240).

Almost surely, 2^21365414021 is an apocalyptic number.

It is an amenable number.

21365414021 is a deficient number, since it is larger than the sum of its proper divisors (3105635899).

21365414021 is an equidigital number, since it uses as much as digits as its factorization.

21365414021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6679243.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21365414021 in words is "twenty-one billion, three hundred sixty-five million, four hundred fourteen thousand, twenty-one".