21480499 has 2 divisors, whose sum is σ = 21480500. Its totient is φ = 21480498.

The previous prime is 21480497. The next prime is 21480541. The reversal of 21480499 is 99408412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21480499 - 2¹ = 21480497 is a prime.

It is a super-2 number, since 2×21480499² = 922823674578002, which contains 22 as substring.

Together with 21480497, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21480493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10740249 + 10740250.

It is an arithmetic number, because the mean of its divisors is an integer number (10740250).

Almost surely, 2^21480499 is an apocalyptic number.

21480499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21480499 is an equidigital number, since it uses as much as digits as its factorization.

21480499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 21480499 is about 4634.7059237885. The cubic root of 21480499 is about 277.9807924552.

The spelling of 21480499 in words is "twenty-one million, four hundred eighty thousand, four hundred ninety-nine".