21431140201 has 4 divisors (see below), whose sum is σ = 21466101892. Its totient is φ = 21396178512.

The previous prime is 21431140189. The next prime is 21431140301. The reversal of 21431140201 is 10204113412.

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 9620667225 + 11810472976 = 98085^2 + 108676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21431140201 - 2¹¹ = 21431138153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431140001) 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, 17479926 + ... + 17481151.

It is an arithmetic number, because the mean of its divisors is an integer number (5366525473).

Almost surely, 2^21431140201 is an apocalyptic number.

It is an amenable number.

21431140201 is a deficient number, since it is larger than the sum of its proper divisors (34961691).

21431140201 is an equidigital number, since it uses as much as digits as its factorization.

21431140201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34961690.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21431140201 its reverse (10204113412), we get a palindrome (31635253613).

The spelling of 21431140201 in words is "twenty-one billion, four hundred thirty-one million, one hundred forty thousand, two hundred one".