21892943 has 4 divisors (see below), whose sum is σ = 21902400. Its totient is φ = 21883488.

The previous prime is 21892939. The next prime is 21892963. The reversal of 21892943 is 34929812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21892943 - 2² = 21892939 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21892897 and 21892906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21892903) 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, 1346 + ... + 6752.

It is an arithmetic number, because the mean of its divisors is an integer number (5475600).

Almost surely, 2^21892943 is an apocalyptic number.

21892943 is a deficient number, since it is larger than the sum of its proper divisors (9457).

21892943 is an equidigital number, since it uses as much as digits as its factorization.

21892943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9456.

The product of its digits is 31104, while the sum is 38.

The square root of 21892943 is about 4678.9895276651. The cubic root of 21892943 is about 279.7486818060.

The spelling of 21892943 in words is "twenty-one million, eight hundred ninety-two thousand, nine hundred forty-three".