21023233249 has 2 divisors, whose sum is σ = 21023233250. Its totient is φ = 21023233248.

The previous prime is 21023233223. The next prime is 21023233303. The reversal of 21023233249 is 94233232012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20400980224 + 622253025 = 142832^2 + 24945^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023233249 - 2¹⁵ = 21023200481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21023233249.

It is not a weakly prime, because it can be changed into another prime (21023233219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511616624 + 10511616625.

It is an arithmetic number, because the mean of its divisors is an integer number (10511616625).

Almost surely, 2^21023233249 is an apocalyptic number.

It is an amenable number.

21023233249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023233249 is an equidigital number, since it uses as much as digits as its factorization.

21023233249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The spelling of 21023233249 in words is "twenty-one billion, twenty-three million, two hundred thirty-three thousand, two hundred forty-nine".