21431212301 has 4 divisors (see below), whose sum is σ = 21652152732. Its totient is φ = 21210271872.

The previous prime is 21431212273. The next prime is 21431212303. The reversal of 21431212301 is 10321213412.

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 3654323401 + 17776888900 = 60451^2 + 133330^2 .

It is a cyclic number.

It is not a de Polignac number, because 21431212301 - 2³⁰ = 20357470477 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 (21431212303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110470070 + ... + 110470263.

It is an arithmetic number, because the mean of its divisors is an integer number (5413038183).

Almost surely, 2^21431212301 is an apocalyptic number.

It is an amenable number.

21431212301 is a deficient number, since it is larger than the sum of its proper divisors (220940431).

21431212301 is an equidigital number, since it uses as much as digits as its factorization.

21431212301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220940430.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21431212301 its reverse (10321213412), we get a palindrome (31752425713).

The spelling of 21431212301 in words is "twenty-one billion, four hundred thirty-one million, two hundred twelve thousand, three hundred one".