21220159 has 2 divisors, whose sum is σ = 21220160. Its totient is φ = 21220158.

The previous prime is 21220153. The next prime is 21220211. The reversal of 21220159 is 95102212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220159 - 2¹⁷ = 21089087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610079 + 10610080.

It is an arithmetic number, because the mean of its divisors is an integer number (10610080).

Almost surely, 2^21220159 is an apocalyptic number.

21220159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220159 is an equidigital number, since it uses as much as digits as its factorization.

21220159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21220159 is about 4606.5343806380. The cubic root of 21220159 is about 276.8531980278.

The spelling of 21220159 in words is "twenty-one million, two hundred twenty thousand, one hundred fifty-nine".