21323001149 has 2 divisors, whose sum is σ = 21323001150. Its totient is φ = 21323001148.

The previous prime is 21323001113. The next prime is 21323001151. The reversal of 21323001149 is 94110032312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17307244249 + 4015756900 = 131557^2 + 63370^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323001149 - 2⁸ = 21323000893 is a prime.

Together with 21323001151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323006149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661500574 + 10661500575.

It is an arithmetic number, because the mean of its divisors is an integer number (10661500575).

Almost surely, 2^21323001149 is an apocalyptic number.

It is an amenable number.

21323001149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323001149 is an equidigital number, since it uses as much as digits as its factorization.

21323001149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21323001149 in words is "twenty-one billion, three hundred twenty-three million, one thousand, one hundred forty-nine".