211112001 has 20 divisors (see below), whose sum is σ = 333917892. Its totient is φ = 132461568.

The previous prime is 211111997. The next prime is 211112023. The reversal of 211112001 is 100211112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75272976 + 135839025 = 8676^2 + 11655^2 .

It is not a de Polignac number, because 211112001 - 2² = 211111997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (211112071) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75280 + ... + 78033.

Almost surely, 2^211112001 is an apocalyptic number.

It is an amenable number.

211112001 is a deficient number, since it is larger than the sum of its proper divisors (122805891).

211112001 is a wasteful number, since it uses less digits than its factorization.

211112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153342 (or 153333 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 211112001 is about 14529.6937682802. The cubic root of 211112001 is about 595.4394992117.

Adding to 211112001 its reverse (100211112), we get a palindrome (311323113).

The spelling of 211112001 in words is "two hundred eleven million, one hundred twelve thousand, one".