21352049 has 2 divisors, whose sum is σ = 21352050. Its totient is φ = 21352048.

The previous prime is 21352039. The next prime is 21352061. The reversal of 21352049 is 94025312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21298225 + 53824 = 4615^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 21352049 - 2¹⁶ = 21286513 is a prime.

It is not a weakly prime, because it can be changed into another prime (21352039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676024 + 10676025.

It is an arithmetic number, because the mean of its divisors is an integer number (10676025).

Almost surely, 2^21352049 is an apocalyptic number.

It is an amenable number.

21352049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352049 is an equidigital number, since it uses as much as digits as its factorization.

21352049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21352049 is about 4620.8277397021. The cubic root of 21352049 is about 277.4255905248.

The spelling of 21352049 in words is "twenty-one million, three hundred fifty-two thousand, forty-nine".