201430921 has 2 divisors, whose sum is σ = 201430922. Its totient is φ = 201430920.

The previous prime is 201430787. The next prime is 201430927. The reversal of 201430921 is 129034102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190302025 + 11128896 = 13795^2 + 3336^2 .

It is a cyclic number.

It is not a de Polignac number, because 201430921 - 2⁹ = 201430409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201430892 and 201430901.

It is not a weakly prime, because it can be changed into another prime (201430927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100715460 + 100715461.

It is an arithmetic number, because the mean of its divisors is an integer number (100715461).

Almost surely, 2^201430921 is an apocalyptic number.

It is an amenable number.

201430921 is a deficient number, since it is larger than the sum of its proper divisors (1).

201430921 is an equidigital number, since it uses as much as digits as its factorization.

201430921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 201430921 is about 14192.6361540061. The cubic root of 201430921 is about 586.1949141356.

The spelling of 201430921 in words is "two hundred one million, four hundred thirty thousand, nine hundred twenty-one".