21430409205 has 8 divisors (see below), whose sum is σ = 34288654752. Its totient is φ = 11429551568.

The previous prime is 21430409201. The next prime is 21430409227. The reversal of 21430409205 is 50290403412.

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 21430409205 - 2² = 21430409201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430409201) 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, 714346959 + ... + 714346988.

It is an arithmetic number, because the mean of its divisors is an integer number (4286081844).

Almost surely, 2^21430409205 is an apocalyptic number.

It is an amenable number.

21430409205 is a deficient number, since it is larger than the sum of its proper divisors (12858245547).

21430409205 is a wasteful number, since it uses less digits than its factorization.

21430409205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428693955.

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 21430409205 in words is "twenty-one billion, four hundred thirty million, four hundred nine thousand, two hundred five".