21150943 has 4 divisors (see below), whose sum is σ = 23073768. Its totient is φ = 19228120.

The previous prime is 21150937. The next prime is 21150949. The reversal of 21150943 is 34905112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21150937) and next prime (21150949).

It is a cyclic number.

It is not a de Polignac number, because 21150943 - 2⁵ = 21150911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150949) 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, 961396 + ... + 961417.

It is an arithmetic number, because the mean of its divisors is an integer number (5768442).

Almost surely, 2^21150943 is an apocalyptic number.

21150943 is a deficient number, since it is larger than the sum of its proper divisors (1922825).

21150943 is a wasteful number, since it uses less digits than its factorization.

21150943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922824.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21150943 is about 4599.0154381128. The cubic root of 21150943 is about 276.5518565259.

The spelling of 21150943 in words is "twenty-one million, one hundred fifty thousand, nine hundred forty-three".