21214372 has 24 divisors (see below), whose sum is σ = 38920896. Its totient is φ = 10098528.

The previous prime is 21214327. The next prime is 21214373. The reversal of 21214372 is 27341212.

It is not an unprimeable number, because it can be changed into a prime (21214373) 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 7 ways as a sum of consecutive naturals, for example, 26563 + ... + 27349.

It is an arithmetic number, because the mean of its divisors is an integer number (1621704).

Almost surely, 2^21214372 is an apocalyptic number.

It is an amenable number.

21214372 is a deficient number, since it is larger than the sum of its proper divisors (17706524).

21214372 is a wasteful number, since it uses less digits than its factorization.

21214372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1105 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 21214372 is about 4605.9062083373. The cubic root of 21214372 is about 276.8280286418.

Adding to 21214372 its reverse (27341212), we get a palindrome (48555584).

The spelling of 21214372 in words is "twenty-one million, two hundred fourteen thousand, three hundred seventy-two".