201121251 has 16 divisors (see below), whose sum is σ = 282998400. Its totient is φ = 126698688.

The previous prime is 201121229. The next prime is 201121253. The reversal of 201121251 is 152121102.

It is not a de Polignac number, because 201121251 - 2⁹ = 201120739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201121251.

It is not an unprimeable number, because it can be changed into a prime (201121253) 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, 19000 + ... + 27626.

It is an arithmetic number, because the mean of its divisors is an integer number (17687400).

Almost surely, 2^201121251 is an apocalyptic number.

201121251 is a deficient number, since it is larger than the sum of its proper divisors (81877149).

201121251 is a wasteful number, since it uses less digits than its factorization.

201121251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9058.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 201121251 is about 14181.7224271243. The cubic root of 201121251 is about 585.8943643139.

Adding to 201121251 its reverse (152121102), we get a palindrome (353242353).

The spelling of 201121251 in words is "two hundred one million, one hundred twenty-one thousand, two hundred fifty-one".