21422927 has 8 divisors (see below), whose sum is σ = 21710976. Its totient is φ = 21137112.

The previous prime is 21422897. The next prime is 21422939. The reversal of 21422927 is 72922412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21422927 - 2¹⁰ = 21421903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21422927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26828 + ... + 27614.

It is an arithmetic number, because the mean of its divisors is an integer number (2713872).

Almost surely, 2^21422927 is an apocalyptic number.

21422927 is a deficient number, since it is larger than the sum of its proper divisors (288049).

21422927 is a wasteful number, since it uses less digits than its factorization.

21422927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117.

The product of its digits is 4032, while the sum is 29.

The square root of 21422927 is about 4628.4907907438. The cubic root of 21422927 is about 277.7322223545.

The spelling of 21422927 in words is "twenty-one million, four hundred twenty-two thousand, nine hundred twenty-seven".