21304543421 has 8 divisors (see below), whose sum is σ = 25629526080. Its totient is φ = 17299929888.

The previous prime is 21304543399. The next prime is 21304543433. The reversal of 21304543421 is 12434540312.

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 21304543421 - 2²² = 21300349117 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 (21304543721) 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, 80092136 + ... + 80092401.

It is an arithmetic number, because the mean of its divisors is an integer number (3203690760).

Almost surely, 2^21304543421 is an apocalyptic number.

It is an amenable number.

21304543421 is a deficient number, since it is larger than the sum of its proper divisors (4324982659).

21304543421 is a wasteful number, since it uses less digits than its factorization.

21304543421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160184563.

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 21304543421 in words is "twenty-one billion, three hundred four million, five hundred forty-three thousand, four hundred twenty-one".