21602059 has 2 divisors, whose sum is σ = 21602060. Its totient is φ = 21602058.

The previous prime is 21602041. The next prime is 21602081. The reversal of 21602059 is 95020612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21602059 - 2¹¹ = 21600011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21602029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801029 + 10801030.

It is an arithmetic number, because the mean of its divisors is an integer number (10801030).

Almost surely, 2^21602059 is an apocalyptic number.

21602059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21602059 is an equidigital number, since it uses as much as digits as its factorization.

21602059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21602059 is about 4647.8015233011. The cubic root of 21602059 is about 278.5041788388.

It can be divided in two parts, 2 and 1602059, that added together give a palindrome (1602061).

The spelling of 21602059 in words is "twenty-one million, six hundred two thousand, fifty-nine".