21941223 has 16 divisors (see below), whose sum is σ = 30328320. Its totient is φ = 14099904.

The previous prime is 21941207. The next prime is 21941233. The reversal of 21941223 is 32214912.

It is not a de Polignac number, because 21941223 - 2⁴ = 21941207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21941193 and 21941202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9115 + ... + 11267.

It is an arithmetic number, because the mean of its divisors is an integer number (1895520).

Almost surely, 2^21941223 is an apocalyptic number.

21941223 is a deficient number, since it is larger than the sum of its proper divisors (8387097).

21941223 is a wasteful number, since it uses less digits than its factorization.

21941223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278.

The product of its digits is 864, while the sum is 24.

The square root of 21941223 is about 4684.1459200157. The cubic root of 21941223 is about 279.9541719214.

The spelling of 21941223 in words is "twenty-one million, nine hundred forty-one thousand, two hundred twenty-three".