21572536201 has 4 divisors (see below), whose sum is σ = 21572841472. Its totient is φ = 21572230932.

The previous prime is 21572536199. The next prime is 21572536231. The reversal of 21572536201 is 10263527512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21572536201 - 2¹ = 21572536199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21572536231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14020 + ... + 208186.

It is an arithmetic number, because the mean of its divisors is an integer number (5393210368).

Almost surely, 2^21572536201 is an apocalyptic number.

It is an amenable number.

21572536201 is a deficient number, since it is larger than the sum of its proper divisors (305271).

21572536201 is a wasteful number, since it uses less digits than its factorization.

21572536201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305270.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 21572536201 in words is "twenty-one billion, five hundred seventy-two million, five hundred thirty-six thousand, two hundred one".