21112201 has 6 divisors (see below), whose sum is σ = 23206106. Its totient is φ = 19192800.

The previous prime is 21112199. The next prime is 21112207. The reversal of 21112201 is 10221112.

It can be written as a sum of positive squares in only one way, i.e., 17015625 + 4096576 = 4125^2 + 2024^2 .

It is not a de Polignac number, because 21112201 - 2¹ = 21112199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87120 + ... + 87361.

Almost surely, 2^21112201 is an apocalyptic number.

It is an amenable number.

21112201 is a deficient number, since it is larger than the sum of its proper divisors (2093905).

21112201 is a wasteful number, since it uses less digits than its factorization.

21112201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174503 (or 174492 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21112201 is about 4594.8015191083. The cubic root of 21112201 is about 276.3829007749.

Adding to 21112201 its reverse (10221112), we get a palindrome (31333313).

The spelling of 21112201 in words is "twenty-one million, one hundred twelve thousand, two hundred one".