201121401 has 16 divisors (see below), whose sum is σ = 291654720. Its totient is φ = 122539200.

The previous prime is 201121387. The next prime is 201121421. The reversal of 201121401 is 104121102.

It is a happy number.

It is not a de Polignac number, because 201121401 - 2⁵ = 201121369 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201121421) 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, 21591 + ... + 29468.

It is an arithmetic number, because the mean of its divisors is an integer number (18228420).

Almost surely, 2^201121401 is an apocalyptic number.

It is an amenable number.

201121401 is a deficient number, since it is larger than the sum of its proper divisors (90533319).

201121401 is a wasteful number, since it uses less digits than its factorization.

201121401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51176.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 201121401 is about 14181.7277156205. The cubic root of 201121401 is about 585.8945099709.

Adding to 201121401 its reverse (104121102), we get a palindrome (305242503).

The spelling of 201121401 in words is "two hundred one million, one hundred twenty-one thousand, four hundred one".