21255210201 has 8 divisors (see below), whose sum is σ = 29031506784. Its totient is φ = 13824526880.

The previous prime is 21255210173. The next prime is 21255210227. The reversal of 21255210201 is 10201255212.

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 21255210201 - 2¹¹ = 21255208153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21255210101) 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, 86403171 + ... + 86403416.

It is an arithmetic number, because the mean of its divisors is an integer number (3628938348).

Almost surely, 2^21255210201 is an apocalyptic number.

It is an amenable number.

21255210201 is a deficient number, since it is larger than the sum of its proper divisors (7776296583).

21255210201 is a wasteful number, since it uses less digits than its factorization.

21255210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172806631.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 21255210201 its reverse (10201255212), we get a palindrome (31456465413).

The spelling of 21255210201 in words is "twenty-one billion, two hundred fifty-five million, two hundred ten thousand, two hundred one".