21662072 has 16 divisors (see below), whose sum is σ = 42017400. Its totient is φ = 10457440.

The previous prime is 21662059. The next prime is 21662117. The reversal of 21662072 is 27026612.

It is a congruent number.

It is an unprimeable number.

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, 46454 + ... + 46917.

Almost surely, 2^21662072 is an apocalyptic number.

It is an amenable number.

21662072 is a deficient number, since it is larger than the sum of its proper divisors (20355328).

21662072 is a wasteful number, since it uses less digits than its factorization.

21662072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93406 (or 93402 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 21662072 is about 4654.2531087168. The cubic root of 21662072 is about 278.7618459041.

Adding to 21662072 its reverse (27026612), we get a palindrome (48688684).

The spelling of 21662072 in words is "twenty-one million, six hundred sixty-two thousand, seventy-two".