21113500201 has 4 divisors (see below), whose sum is σ = 21247981252. Its totient is φ = 20979019152.

The previous prime is 21113500159. The next prime is 21113500229. The reversal of 21113500201 is 10200531112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14859853801 + 6253646400 = 121901^2 + 79080^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113500201 - 2³³ = 12523565609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113500231) 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, 67240290 + ... + 67240603.

It is an arithmetic number, because the mean of its divisors is an integer number (5311995313).

Almost surely, 2^21113500201 is an apocalyptic number.

It is an amenable number.

21113500201 is a deficient number, since it is larger than the sum of its proper divisors (134481051).

21113500201 is a wasteful number, since it uses less digits than its factorization.

21113500201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134481050.

The product of its (nonzero) digits is 60, while the sum is 16.

The spelling of 21113500201 in words is "twenty-one billion, one hundred thirteen million, five hundred thousand, two hundred one".