21224159 has 16 divisors (see below), whose sum is σ = 24554880. Its totient is φ = 18142560.

The previous prime is 21224149. The next prime is 21224167. The reversal of 21224159 is 95142212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21224159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224149) 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, 35864 + ... + 36450.

It is an arithmetic number, because the mean of its divisors is an integer number (1534680).

Almost surely, 2^21224159 is an apocalyptic number.

21224159 is a deficient number, since it is larger than the sum of its proper divisors (3330721).

21224159 is a wasteful number, since it uses less digits than its factorization.

21224159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790.

The product of its digits is 1440, while the sum is 26.

The square root of 21224159 is about 4606.9685260483. The cubic root of 21224159 is about 276.8705925443.

The spelling of 21224159 in words is "twenty-one million, two hundred twenty-four thousand, one hundred fifty-nine".