21112242201 has 24 divisors (see below), whose sum is σ = 31790903040. Its totient is φ = 13485924000.

The previous prime is 21112242199. The next prime is 21112242209. The reversal of 21112242201 is 10224221112.

21112242201 is a `hidden beast` number, since 211 + 12 + 242 + 201 = 666.

It is not a de Polignac number, because 21112242201 - 2¹ = 21112242199 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21112242209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346431 + ... + 402788.

It is an arithmetic number, because the mean of its divisors is an integer number (1324620960).

Almost surely, 2^21112242201 is an apocalyptic number.

It is an amenable number.

21112242201 is a deficient number, since it is larger than the sum of its proper divisors (10678660839).

21112242201 is a wasteful number, since it uses less digits than its factorization.

21112242201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749357 (or 749354 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21112242201 its reverse (10224221112), we get a palindrome (31336463313).

The spelling of 21112242201 in words is "twenty-one billion, one hundred twelve million, two hundred forty-two thousand, two hundred one".