21327051 has 16 divisors (see below), whose sum is σ = 29030400. Its totient is φ = 13923840.

The previous prime is 21327043. The next prime is 21327067. The reversal of 21327051 is 15072312.

It is not a de Polignac number, because 21327051 - 2³ = 21327043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21327001) 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 15 ways as a sum of consecutive naturals, for example, 47275 + ... + 47723.

It is an arithmetic number, because the mean of its divisors is an integer number (1814400).

Almost surely, 2^21327051 is an apocalyptic number.

21327051 is a deficient number, since it is larger than the sum of its proper divisors (7703349).

21327051 is a wasteful number, since it uses less digits than its factorization.

21327051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21327051 is about 4618.1220209085. The cubic root of 21327051 is about 277.3172825259.

Adding to 21327051 its reverse (15072312), we get a palindrome (36399363).

The spelling of 21327051 in words is "twenty-one million, three hundred twenty-seven thousand, fifty-one".