21530572005 has 8 divisors (see below), whose sum is σ = 34448915232. Its totient is φ = 11482971728.

The previous prime is 21530571973. The next prime is 21530572013. The reversal of 21530572005 is 50027503512.

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 21530572005 - 2⁵ = 21530571973 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717685719 + ... + 717685748.

It is an arithmetic number, because the mean of its divisors is an integer number (4306114404).

Almost surely, 2^21530572005 is an apocalyptic number.

It is an amenable number.

21530572005 is a deficient number, since it is larger than the sum of its proper divisors (12918343227).

21530572005 is a wasteful number, since it uses less digits than its factorization.

21530572005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435371475.

The product of its (nonzero) digits is 10500, while the sum is 30.

The spelling of 21530572005 in words is "twenty-one billion, five hundred thirty million, five hundred seventy-two thousand, five".