21206796 has 36 divisors (see below), whose sum is σ = 53586792. Its totient is φ = 6524544.

The previous prime is 21206791. The next prime is 21206797. The reversal of 21206796 is 69760212.

It is not an unprimeable number, because it can be changed into a prime (21206791) 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 11 ways as a sum of consecutive naturals, for example, 3201 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (1488522).

Almost surely, 2^21206796 is an apocalyptic number.

21206796 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21206796 is an abundant number, since it is smaller than the sum of its proper divisors (32379996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21206796 is a wasteful number, since it uses less digits than its factorization.

21206796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10490 (or 10475 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21206796 is about 4605.0837125942. The cubic root of 21206796 is about 276.7950714426.

The spelling of 21206796 in words is "twenty-one million, two hundred six thousand, seven hundred ninety-six".