21010201 has 4 divisors (see below), whose sum is σ = 21923712. Its totient is φ = 20096692.

The previous prime is 21010193. The next prime is 21010217. The reversal of 21010201 is 10201012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21010201 - 2³ = 21010193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456721 + ... + 456766.

It is an arithmetic number, because the mean of its divisors is an integer number (5480928).

Almost surely, 2^21010201 is an apocalyptic number.

It is an amenable number.

21010201 is a deficient number, since it is larger than the sum of its proper divisors (913511).

21010201 is an equidigital number, since it uses as much as digits as its factorization.

21010201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913510.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 21010201 is about 4583.6885801721. The cubic root of 21010201 is about 275.9370830821.

Adding to 21010201 its reverse (10201012), we get a palindrome (31211213).

The spelling of 21010201 in words is "twenty-one million, ten thousand, two hundred one".