21212696 has 16 divisors (see below), whose sum is σ = 39952440. Its totient is φ = 10558720.

The previous prime is 21212677. The next prime is 21212701. The reversal of 21212696 is 69621212.

It is a happy number.

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, 4025 + ... + 7656.

Almost surely, 2^21212696 is an apocalyptic number.

It is an amenable number.

21212696 is a deficient number, since it is larger than the sum of its proper divisors (18739744).

21212696 is a wasteful number, since it uses less digits than its factorization.

21212696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11914 (or 11910 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 21212696 is about 4605.7242644344. The cubic root of 21212696 is about 276.8207383640.

The spelling of 21212696 in words is "twenty-one million, two hundred twelve thousand, six hundred ninety-six".