21162959 has 2 divisors, whose sum is σ = 21162960. Its totient is φ = 21162958.

The previous prime is 21162949. The next prime is 21162989. The reversal of 21162959 is 95926112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21162959 - 2¹⁶ = 21097423 is a prime.

It is a Sophie Germain 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 (21162949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581479 + 10581480.

It is an arithmetic number, because the mean of its divisors is an integer number (10581480).

Almost surely, 2^21162959 is an apocalyptic number.

21162959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162959 is an equidigital number, since it uses as much as digits as its factorization.

21162959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 21162959 is about 4600.3216191914. The cubic root of 21162959 is about 276.6042169656.

The spelling of 21162959 in words is "twenty-one million, one hundred sixty-two thousand, nine hundred fifty-nine".