21333133249 has 2 divisors, whose sum is σ = 21333133250. Its totient is φ = 21333133248.

The previous prime is 21333133231. The next prime is 21333133277. The reversal of 21333133249 is 94233133312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21310160400 + 22972849 = 145980^2 + 4793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21333133249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21333133049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666566624 + 10666566625.

It is an arithmetic number, because the mean of its divisors is an integer number (10666566625).

Almost surely, 2^21333133249 is an apocalyptic number.

It is an amenable number.

21333133249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333133249 is an equidigital number, since it uses as much as digits as its factorization.

21333133249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 34.

The spelling of 21333133249 in words is "twenty-one billion, three hundred thirty-three million, one hundred thirty-three thousand, two hundred forty-nine".