21252505201 has 8 divisors (see below), whose sum is σ = 21754730624. Its totient is φ = 20750642640.

The previous prime is 21252505193. The next prime is 21252505207. The reversal of 21252505201 is 10250525212.

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 21252505201 - 2³ = 21252505193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21252505207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29671 + ... + 208291.

It is an arithmetic number, because the mean of its divisors is an integer number (2719341328).

Almost surely, 2^21252505201 is an apocalyptic number.

It is an amenable number.

21252505201 is a deficient number, since it is larger than the sum of its proper divisors (502225423).

21252505201 is a wasteful number, since it uses less digits than its factorization.

21252505201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181431.

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 21252505201 in words is "twenty-one billion, two hundred fifty-two million, five hundred five thousand, two hundred one".