21210202301 has 4 divisors (see below), whose sum is σ = 21211086492. Its totient is φ = 21209318112.

The previous prime is 21210202297. The next prime is 21210202313. The reversal of 21210202301 is 10320201212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17882643076 + 3327559225 = 133726^2 + 57685^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210202301 - 2² = 21210202297 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210202501) 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, 405080 + ... + 454433.

It is an arithmetic number, because the mean of its divisors is an integer number (5302771623).

Almost surely, 2^21210202301 is an apocalyptic number.

It is an amenable number.

21210202301 is a deficient number, since it is larger than the sum of its proper divisors (884191).

21210202301 is an equidigital number, since it uses as much as digits as its factorization.

21210202301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884190.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21210202301 its reverse (10320201212), we get a palindrome (31530403513).

The spelling of 21210202301 in words is "twenty-one billion, two hundred ten million, two hundred two thousand, three hundred one".