21422943 has 12 divisors (see below), whose sum is σ = 30986488. Its totient is φ = 14262480.

The previous prime is 21422939. The next prime is 21422993. The reversal of 21422943 is 34922412.

It is not a de Polignac number, because 21422943 - 2² = 21422939 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 (21422993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8988 + ... + 11118.

Almost surely, 2^21422943 is an apocalyptic number.

21422943 is a deficient number, since it is larger than the sum of its proper divisors (9563545).

21422943 is a wasteful number, since it uses less digits than its factorization.

21422943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254 (or 3251 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21422943 is about 4628.4925191686. The cubic root of 21422943 is about 277.7322914972.

The spelling of 21422943 in words is "twenty-one million, four hundred twenty-two thousand, nine hundred forty-three".