21383914901 has 2 divisors, whose sum is σ = 21383914902. Its totient is φ = 21383914900.

The previous prime is 21383914897. The next prime is 21383914961. The reversal of 21383914901 is 10941938312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13617723025 + 7766191876 = 116695^2 + 88126^2 .

It is a cyclic number.

It is not a de Polignac number, because 21383914901 - 2² = 21383914897 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21383914961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10691957450 + 10691957451.

It is an arithmetic number, because the mean of its divisors is an integer number (10691957451).

Almost surely, 2^21383914901 is an apocalyptic number.

It is an amenable number.

21383914901 is a deficient number, since it is larger than the sum of its proper divisors (1).

21383914901 is an equidigital number, since it uses as much as digits as its factorization.

21383914901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 21383914901 in words is "twenty-one billion, three hundred eighty-three million, nine hundred fourteen thousand, nine hundred one".