21996223 has 2 divisors, whose sum is σ = 21996224. Its totient is φ = 21996222.

The previous prime is 21996217. The next prime is 21996229. The reversal of 21996223 is 32269912.

It is a balanced prime because it is at equal distance from previous prime (21996217) and next prime (21996229).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21996223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21996229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10998111 + 10998112.

It is an arithmetic number, because the mean of its divisors is an integer number (10998112).

Almost surely, 2^21996223 is an apocalyptic number.

21996223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21996223 is an equidigital number, since it uses as much as digits as its factorization.

21996223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 21996223 is about 4690.0131129881. The cubic root of 21996223 is about 280.1878968409.

The spelling of 21996223 in words is "twenty-one million, nine hundred ninety-six thousand, two hundred twenty-three".