21233500349 has 2 divisors, whose sum is σ = 21233500350. Its totient is φ = 21233500348.

The previous prime is 21233500243. The next prime is 21233500357. The reversal of 21233500349 is 94300533212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17944477849 + 3289022500 = 133957^2 + 57350^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233500349 - 2²⁴ = 21216723133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233560349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616750174 + 10616750175.

It is an arithmetic number, because the mean of its divisors is an integer number (10616750175).

Almost surely, 2^21233500349 is an apocalyptic number.

It is an amenable number.

21233500349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233500349 is an equidigital number, since it uses as much as digits as its factorization.

21233500349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 32.

The spelling of 21233500349 in words is "twenty-one billion, two hundred thirty-three million, five hundred thousand, three hundred forty-nine".