21202311901 has 2 divisors, whose sum is σ = 21202311902. Its totient is φ = 21202311900.

The previous prime is 21202311899. The next prime is 21202311931. The reversal of 21202311901 is 10911320212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20860024900 + 342287001 = 144430^2 + 18501^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202311901 - 2¹ = 21202311899 is a prime.

Together with 21202311899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202311931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601155950 + 10601155951.

It is an arithmetic number, because the mean of its divisors is an integer number (10601155951).

Almost surely, 2^21202311901 is an apocalyptic number.

It is an amenable number.

21202311901 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202311901 is an equidigital number, since it uses as much as digits as its factorization.

21202311901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21202311901 in words is "twenty-one billion, two hundred two million, three hundred eleven thousand, nine hundred one".