201122001 has 16 divisors (see below), whose sum is σ = 298288320. Its totient is φ = 133932960.

The previous prime is 201121993. The next prime is 201122021. The reversal of 201122001 is 100221102.

It is not a de Polignac number, because 201122001 - 2³ = 201121993 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 (201122021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24286 + ... + 31496.

It is an arithmetic number, because the mean of its divisors is an integer number (18643020).

Almost surely, 2^201122001 is an apocalyptic number.

It is an amenable number.

201122001 is a deficient number, since it is larger than the sum of its proper divisors (97166319).

201122001 is a wasteful number, since it uses less digits than its factorization.

201122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253 (or 8247 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 201122001 is about 14181.7488695859. The cubic root of 201122001 is about 585.8950925980.

Adding to 201122001 its reverse (100221102), we get a palindrome (301343103).

The spelling of 201122001 in words is "two hundred one million, one hundred twenty-two thousand, one".