201121993 has 2 divisors, whose sum is σ = 201121994. Its totient is φ = 201121992.

The previous prime is 201121981. The next prime is 201122021. The reversal of 201121993 is 399121102.

It is an a-pointer prime, because the next prime (201122021) can be obtained adding 201121993 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193432464 + 7689529 = 13908^2 + 2773^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121993 - 2⁵ = 201121961 is a prime.

It is not a weakly prime, because it can be changed into another prime (201121093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560996 + 100560997.

It is an arithmetic number, because the mean of its divisors is an integer number (100560997).

Almost surely, 2^201121993 is an apocalyptic number.

It is an amenable number.

201121993 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121993 is an equidigital number, since it uses as much as digits as its factorization.

201121993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 201121993 is about 14181.7485875332. The cubic root of 201121993 is about 585.8950848297.

The spelling of 201121993 in words is "two hundred one million, one hundred twenty-one thousand, nine hundred ninety-three".