21822416 has 40 divisors (see below), whose sum is σ = 52716864. Its totient is φ = 8501760.

The previous prime is 21822403. The next prime is 21822421. The reversal of 21822416 is 61422812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7625 + ... + 10088.

Almost surely, 2^21822416 is an apocalyptic number.

It is an amenable number.

21822416 is an abundant number, since it is smaller than the sum of its proper divisors (30894448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21822416 is a wasteful number, since it uses less digits than its factorization.

21822416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17739 (or 17733 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 21822416 is about 4671.4468850668. The cubic root of 21822416 is about 279.4479599478.

The spelling of 21822416 in words is "twenty-one million, eight hundred twenty-two thousand, four hundred sixteen".