201121919 has 2 divisors, whose sum is σ = 201121920. Its totient is φ = 201121918.

The previous prime is 201121901. The next prime is 201121957. The reversal of 201121919 is 919121102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201121919 - 2¹² = 201117823 is a prime.

It is a super-2 number, since 2×201121919² = 80900052604485122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560959 + 100560960.

It is an arithmetic number, because the mean of its divisors is an integer number (100560960).

Almost surely, 2^201121919 is an apocalyptic number.

201121919 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121919 is an equidigital number, since it uses as much as digits as its factorization.

201121919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 201121919 is about 14181.7459785458. The cubic root of 201121919 is about 585.8950129724.

The spelling of 201121919 in words is "two hundred one million, one hundred twenty-one thousand, nine hundred nineteen".