21302009969 has 2 divisors, whose sum is σ = 21302009970. Its totient is φ = 21302009968.

The previous prime is 21302009957. The next prime is 21302010049. The reversal of 21302009969 is 96990020312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16801344400 + 4500665569 = 129620^2 + 67087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302009969 is a prime.

It is a super-2 number, since 2×21302009969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21302009909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651004984 + 10651004985.

It is an arithmetic number, because the mean of its divisors is an integer number (10651004985).

Almost surely, 2^21302009969 is an apocalyptic number.

It is an amenable number.

21302009969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302009969 is an equidigital number, since it uses as much as digits as its factorization.

21302009969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The spelling of 21302009969 in words is "twenty-one billion, three hundred two million, nine thousand, nine hundred sixty-nine".