21361059 has 12 divisors (see below), whose sum is σ = 30940416. Its totient is φ = 14201232.

The previous prime is 21361051. The next prime is 21361063. The reversal of 21361059 is 95016312.

It is not a de Polignac number, because 21361059 - 2³ = 21361051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21361051) 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 in 11 ways as a sum of consecutive naturals, for example, 349 + ... + 6545.

It is an arithmetic number, because the mean of its divisors is an integer number (2578368).

Almost surely, 2^21361059 is an apocalyptic number.

21361059 is a deficient number, since it is larger than the sum of its proper divisors (9579357).

21361059 is a wasteful number, since it uses less digits than its factorization.

21361059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6586 (or 6583 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 21361059 is about 4621.8025704264. The cubic root of 21361059 is about 277.4646071248.

The spelling of 21361059 in words is "twenty-one million, three hundred sixty-one thousand, fifty-nine".