21740433 has 48 divisors (see below), whose sum is σ = 36465408. Its totient is φ = 11404800.

The previous prime is 21740429. The next prime is 21740443. The reversal of 21740433 is 33404712.

It is not a de Polignac number, because 21740433 - 2² = 21740429 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21740443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 80088 + ... + 80358.

It is an arithmetic number, because the mean of its divisors is an integer number (759696).

Almost surely, 2^21740433 is an apocalyptic number.

It is an amenable number.

21740433 is a deficient number, since it is larger than the sum of its proper divisors (14724975).

21740433 is a wasteful number, since it uses less digits than its factorization.

21740433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 21740433 is about 4662.6637236670. The cubic root of 21740433 is about 279.0975751000.

The spelling of 21740433 in words is "twenty-one million, seven hundred forty thousand, four hundred thirty-three".