21499433 has 4 divisors (see below), whose sum is σ = 21559680. Its totient is φ = 21439188.

The previous prime is 21499427. The next prime is 21499451. The reversal of 21499433 is 33499412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21499433 - 2¹⁶ = 21433897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21499393 and 21499402.

It is not an unprimeable number, because it can be changed into a prime (21499453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29585 + ... + 30302.

It is an arithmetic number, because the mean of its divisors is an integer number (5389920).

Almost surely, 2^21499433 is an apocalyptic number.

It is an amenable number.

21499433 is a deficient number, since it is larger than the sum of its proper divisors (60247).

21499433 is an equidigital number, since it uses as much as digits as its factorization.

21499433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60246.

The product of its digits is 23328, while the sum is 35.

The square root of 21499433 is about 4636.7481061623. The cubic root of 21499433 is about 278.0624439202.

The spelling of 21499433 in words is "twenty-one million, four hundred ninety-nine thousand, four hundred thirty-three".