21219422 has 16 divisors (see below), whose sum is σ = 36447072. Its totient is φ = 9076320.

The previous prime is 21219403. The next prime is 21219431. The reversal of 21219422 is 22491212.

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, 8108 + ... + 10400.

It is an arithmetic number, because the mean of its divisors is an integer number (2277942).

Almost surely, 2^21219422 is an apocalyptic number.

21219422 is a deficient number, since it is larger than the sum of its proper divisors (15227650).

21219422 is a wasteful number, since it uses less digits than its factorization.

21219422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2963.

The product of its digits is 576, while the sum is 23.

The square root of 21219422 is about 4606.4543848822. The cubic root of 21219422 is about 276.8499928497.

The spelling of 21219422 in words is "twenty-one million, two hundred nineteen thousand, four hundred twenty-two".