210901 has 2 divisors, whose sum is σ = 210902. Its totient is φ = 210900.

The previous prime is 210869. The next prime is 210907. The reversal of 210901 is 109012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180625 + 30276 = 425^2 + 174^2 .

It is a cyclic number.

It is not a de Polignac number, because 210901 - 2⁵ = 210869 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105450 + 105451.

It is an arithmetic number, because the mean of its divisors is an integer number (105451).

2²¹⁰⁹⁰¹ is an apocalyptic number.

It is an amenable number.

210901 is a deficient number, since it is larger than the sum of its proper divisors (1).

210901 is an equidigital number, since it uses as much as digits as its factorization.

210901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 210901 is about 459.2395888858. The cubic root of 210901 is about 59.5241057611.

Adding to 210901 its reverse (109012), we get a palindrome (319913).

It can be divided in two parts, 210 and 901, that added together give a palindrome (1111).

The spelling of 210901 in words is "two hundred ten thousand, nine hundred one".