201151421 has 2 divisors, whose sum is σ = 201151422. Its totient is φ = 201151420.

The previous prime is 201151409. The next prime is 201151451. The reversal of 201151421 is 124151102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109202500 + 91948921 = 10450^2 + 9589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201151421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201151421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201151451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100575710 + 100575711.

It is an arithmetic number, because the mean of its divisors is an integer number (100575711).

Almost surely, 2^201151421 is an apocalyptic number.

It is an amenable number.

201151421 is a deficient number, since it is larger than the sum of its proper divisors (1).

201151421 is an equidigital number, since it uses as much as digits as its factorization.

201151421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 201151421 is about 14182.7860803158. The cubic root of 201151421 is about 585.9236593272.

The spelling of 201151421 in words is "two hundred one million, one hundred fifty-one thousand, four hundred twenty-one".