21032321249 has 2 divisors, whose sum is σ = 21032321250. Its totient is φ = 21032321248.

The previous prime is 21032321213. The next prime is 21032321251. The reversal of 21032321249 is 94212323012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20720163025 + 312158224 = 143945^2 + 17668^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032321249 - 2⁸ = 21032320993 is a prime.

It is a super-2 number, since 2×21032321249² (a number of 21 digits) contains 22 as substring.

Together with 21032321251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21032321269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516160624 + 10516160625.

It is an arithmetic number, because the mean of its divisors is an integer number (10516160625).

Almost surely, 2^21032321249 is an apocalyptic number.

It is an amenable number.

21032321249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032321249 is an equidigital number, since it uses as much as digits as its factorization.

21032321249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21032321249 in words is "twenty-one billion, thirty-two million, three hundred twenty-one thousand, two hundred forty-nine".