201121031 has 4 divisors (see below), whose sum is σ = 206026464. Its totient is φ = 196215600.

The previous prime is 201121027. The next prime is 201121051. The reversal of 201121031 is 130121102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201121031 - 2² = 201121027 is a prime.

It is a super-2 number, since 2×201121031² = 80899338221005922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2452655 + ... + 2452736.

It is an arithmetic number, because the mean of its divisors is an integer number (51506616).

Almost surely, 2^201121031 is an apocalyptic number.

201121031 is a deficient number, since it is larger than the sum of its proper divisors (4905433).

201121031 is an equidigital number, since it uses as much as digits as its factorization.

201121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4905432.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 201121031 is about 14181.7146706595. The cubic root of 201121031 is about 585.8941506836.

Adding to 201121031 its reverse (130121102), we get a palindrome (331242133).

The spelling of 201121031 in words is "two hundred one million, one hundred twenty-one thousand, thirty-one".