21212876 has 12 divisors (see below), whose sum is σ = 37171008. Its totient is φ = 10592592.

The previous prime is 21212869. The next prime is 21212887. The reversal of 21212876 is 67821212.

It is a super-2 number, since 2×21212876² = 899972216382752, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (3097584).

Almost surely, 2^21212876 is an apocalyptic number.

It is an amenable number.

21212876 is a deficient number, since it is larger than the sum of its proper divisors (15958132).

21212876 is a wasteful number, since it uses less digits than its factorization.

21212876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6928 (or 6926 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 21212876 is about 4605.7438052936. The cubic root of 21212876 is about 276.8215213478.

The spelling of 21212876 in words is "twenty-one million, two hundred twelve thousand, eight hundred seventy-six".