21516692 has 24 divisors (see below), whose sum is σ = 38465280. Its totient is φ = 10529120.

The previous prime is 21516689. The next prime is 21516731. The reversal of 21516692 is 29661512.

It is a happy number.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67718 + ... + 68034.

It is an arithmetic number, because the mean of its divisors is an integer number (1602720).

Almost surely, 2^21516692 is an apocalyptic number.

It is an amenable number.

21516692 is a deficient number, since it is larger than the sum of its proper divisors (16948588).

21516692 is a wasteful number, since it uses less digits than its factorization.

21516692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 629 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 21516692 is about 4638.6088431770. The cubic root of 21516692 is about 278.1368303178.

The spelling of 21516692 in words is "twenty-one million, five hundred sixteen thousand, six hundred ninety-two".