21409030709 has 8 divisors (see below), whose sum is σ = 23356384128. Its totient is φ = 19461856960.

The previous prime is 21409030703. The next prime is 21409030717. The reversal of 21409030709 is 90703090412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21409030709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21409030703) 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, 374804 + ... + 428130.

It is an arithmetic number, because the mean of its divisors is an integer number (2919548016).

Almost surely, 2^21409030709 is an apocalyptic number.

It is an amenable number.

21409030709 is a deficient number, since it is larger than the sum of its proper divisors (1947353419).

21409030709 is a wasteful number, since it uses less digits than its factorization.

21409030709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89835.

The product of its (nonzero) digits is 13608, while the sum is 35.

The spelling of 21409030709 in words is "twenty-one billion, four hundred nine million, thirty thousand, seven hundred nine".