21422704 has 20 divisors (see below), whose sum is σ = 42629464. Its totient is φ = 10421568.

The previous prime is 21422693. The next prime is 21422707. The reversal of 21422704 is 40722412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17502 + ... + 18685.

Almost surely, 2^21422704 is an apocalyptic number.

It is an amenable number.

21422704 is a deficient number, since it is larger than the sum of its proper divisors (21206760).

21422704 is a wasteful number, since it uses less digits than its factorization.

21422704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36232 (or 36226 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 21422704 is about 4628.4667007552. The cubic root of 21422704 is about 277.7312586751.

The spelling of 21422704 in words is "twenty-one million, four hundred twenty-two thousand, seven hundred four".