201329621 has 2 divisors, whose sum is σ = 201329622. Its totient is φ = 201329620.

The previous prime is 201329599. The next prime is 201329627. The reversal of 201329621 is 126923102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201242596 + 87025 = 14186^2 + 295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201329621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201329627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100664810 + 100664811.

It is an arithmetic number, because the mean of its divisors is an integer number (100664811).

Almost surely, 2^201329621 is an apocalyptic number.

It is an amenable number.

201329621 is a deficient number, since it is larger than the sum of its proper divisors (1).

201329621 is an equidigital number, since it uses as much as digits as its factorization.

201329621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 201329621 is about 14189.0669531157. The cubic root of 201329621 is about 586.0966314726.

The spelling of 201329621 in words is "two hundred one million, three hundred twenty-nine thousand, six hundred twenty-one".