21377433 has 48 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 10808160.

The previous prime is 21377417. The next prime is 21377459. The reversal of 21377433 is 33477312.

It is not a de Polignac number, because 21377433 - 2⁴ = 21377417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21377433.

It is not an unprimeable number, because it can be changed into a prime (21377233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119338 + ... + 119516.

It is an arithmetic number, because the mean of its divisors is an integer number (766080).

Almost surely, 2^21377433 is an apocalyptic number.

It is an amenable number.

21377433 is a deficient number, since it is larger than the sum of its proper divisors (15394407).

21377433 is a wasteful number, since it uses less digits than its factorization.

21377433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 247 counting only the distinct ones).

The product of its digits is 10584, while the sum is 30.

The square root of 21377433 is about 4623.5736178848. The cubic root of 21377433 is about 277.5354844649.

The spelling of 21377433 in words is "twenty-one million, three hundred seventy-seven thousand, four hundred thirty-three".