21160372 has 12 divisors (see below), whose sum is σ = 38307780. Its totient is φ = 10215296.

The previous prime is 21160339. The next prime is 21160379. The reversal of 21160372 is 27306112.

21160372 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 2 ways, for example, as 4218916 + 16941456 = 2054^2 + 4116^2 .

It is a super-2 number, since 2×21160372² = 895522686356768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91093 + ... + 91324.

It is an arithmetic number, because the mean of its divisors is an integer number (3192315).

Almost surely, 2^21160372 is an apocalyptic number.

It is an amenable number.

21160372 is a deficient number, since it is larger than the sum of its proper divisors (17147408).

21160372 is a wasteful number, since it uses less digits than its factorization.

21160372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182450 (or 182448 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21160372 is about 4600.0404346049. The cubic root of 21160372 is about 276.5929456327.

Adding to 21160372 its reverse (27306112), we get a palindrome (48466484).

The spelling of 21160372 in words is "twenty-one million, one hundred sixty thousand, three hundred seventy-two".