21850743 has 8 divisors (see below), whose sum is σ = 29222128. Its totient is φ = 14523264.

The previous prime is 21850733. The next prime is 21850769. The reversal of 21850743 is 34705812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21850743 - 2⁶ = 21850679 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21850743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9796 + ... + 11817.

It is an arithmetic number, because the mean of its divisors is an integer number (3652766).

Almost surely, 2^21850743 is an apocalyptic number.

21850743 is a deficient number, since it is larger than the sum of its proper divisors (7371385).

21850743 is a wasteful number, since it uses less digits than its factorization.

21850743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21953.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 21850743 is about 4674.4778318011. The cubic root of 21850743 is about 279.5688219045.

The spelling of 21850743 in words is "twenty-one million, eight hundred fifty thousand, seven hundred forty-three".