21074499 has 10 divisors (see below), whose sum is σ = 31481780. Its totient is φ = 14049612.

The previous prime is 21074489. The next prime is 21074519. The reversal of 21074499 is 99447012.

It is not a de Polignac number, because 21074499 - 2¹² = 21070403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21074419) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130009 + ... + 130170.

It is an arithmetic number, because the mean of its divisors is an integer number (3148178).

Almost surely, 2^21074499 is an apocalyptic number.

21074499 is a deficient number, since it is larger than the sum of its proper divisors (10407281).

21074499 is an equidigital number, since it uses as much as digits as its factorization.

21074499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260191 (or 260182 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21074499 is about 4590.6970059023. The cubic root of 21074499 is about 276.2182819518.

The spelling of 21074499 in words is "twenty-one million, seventy-four thousand, four hundred ninety-nine".