21400201 has 2 divisors, whose sum is σ = 21400202. Its totient is φ = 21400200.

The previous prime is 21400163. The next prime is 21400217. The reversal of 21400201 is 10200412.

21400201 is nontrivially palindromic in base 13.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20976400 + 423801 = 4580^2 + 651^2 .

It is a cyclic number.

It is not a de Polignac number, because 21400201 - 2⁹ = 21399689 is a prime.

It is not a weakly prime, because it can be changed into another prime (21400271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700100 + 10700101.

It is an arithmetic number, because the mean of its divisors is an integer number (10700101).

Almost surely, 2^21400201 is an apocalyptic number.

It is an amenable number.

21400201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400201 is an equidigital number, since it uses as much as digits as its factorization.

21400201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21400201 is about 4626.0351274066. The cubic root of 21400201 is about 277.6339790770.

Adding to 21400201 its reverse (10200412), we get a palindrome (31600613).

The spelling of 21400201 in words is "twenty-one million, four hundred thousand, two hundred one".