21412943 has 8 divisors (see below), whose sum is σ = 22619520. Its totient is φ = 20214360.

The previous prime is 21412889. The next prime is 21412949. The reversal of 21412943 is 34921412.

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

It is a cyclic number.

It is not a de Polignac number, because 21412943 - 2⁸ = 21412687 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412949) 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, 3998 + ... + 7668.

It is an arithmetic number, because the mean of its divisors is an integer number (2827440).

Almost surely, 2^21412943 is an apocalyptic number.

21412943 is a deficient number, since it is larger than the sum of its proper divisors (1206577).

21412943 is a wasteful number, since it uses less digits than its factorization.

21412943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997.

The product of its digits is 1728, while the sum is 26.

The square root of 21412943 is about 4627.4121277448. The cubic root of 21412943 is about 277.6890706199.

The spelling of 21412943 in words is "twenty-one million, four hundred twelve thousand, nine hundred forty-three".