21874743 has 36 divisors (see below), whose sum is σ = 35479080. Its totient is φ = 12972960.

The previous prime is 21874711. The next prime is 21874751. The reversal of 21874743 is 34747812.

It is a happy number.

21874743 is a `hidden beast` number, since 2 + 187 + 474 + 3 = 666.

It is not a de Polignac number, because 21874743 - 2⁵ = 21874711 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21874698 and 21874707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21874043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57528 + ... + 57906.

It is an arithmetic number, because the mean of its divisors is an integer number (985530).

Almost surely, 2^21874743 is an apocalyptic number.

21874743 is a deficient number, since it is larger than the sum of its proper divisors (13604337).

21874743 is a wasteful number, since it uses less digits than its factorization.

21874743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460 (or 446 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 21874743 is about 4677.0442589311. The cubic root of 21874743 is about 279.6711402663.

The spelling of 21874743 in words is "twenty-one million, eight hundred seventy-four thousand, seven hundred forty-three".