21041299 has 2 divisors, whose sum is σ = 21041300. Its totient is φ = 21041298.

The previous prime is 21041263. The next prime is 21041309. The reversal of 21041299 is 99214012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21041299 - 2⁹ = 21040787 is a prime.

It is not a weakly prime, because it can be changed into another prime (21041239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520649 + 10520650.

It is an arithmetic number, because the mean of its divisors is an integer number (10520650).

Almost surely, 2^21041299 is an apocalyptic number.

21041299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041299 is an equidigital number, since it uses as much as digits as its factorization.

21041299 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 28.

The square root of 21041299 is about 4587.0795720153. The cubic root of 21041299 is about 276.0731576355.

It can be divided in two parts, 2104 and 1299, that added together give a triangular number (3403 = T₈₂).

The spelling of 21041299 in words is "twenty-one million, forty-one thousand, two hundred ninety-nine".