21536822 has 8 divisors (see below), whose sum is σ = 32714400. Its totient is φ = 10632024.

The previous prime is 21536819. The next prime is 21536831. The reversal of 21536822 is 22863512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67997 + ... + 68312.

It is an arithmetic number, because the mean of its divisors is an integer number (4089300).

Almost surely, 2^21536822 is an apocalyptic number.

21536822 is a deficient number, since it is larger than the sum of its proper divisors (11177578).

21536822 is a wasteful number, since it uses less digits than its factorization.

21536822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136390.

The product of its digits is 5760, while the sum is 29.

The square root of 21536822 is about 4640.7781675060. The cubic root of 21536822 is about 278.2235405067.

The spelling of 21536822 in words is "twenty-one million, five hundred thirty-six thousand, eight hundred twenty-two".