21365722 has 8 divisors (see below), whose sum is σ = 36626976. Its totient is φ = 9156732.

The previous prime is 21365699. The next prime is 21365723. The reversal of 21365722 is 22756312.

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

It is not an unprimeable number, because it can be changed into a prime (21365723) 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 3 ways as a sum of consecutive naturals, for example, 763048 + ... + 763075.

It is an arithmetic number, because the mean of its divisors is an integer number (4578372).

Almost surely, 2^21365722 is an apocalyptic number.

21365722 is a deficient number, since it is larger than the sum of its proper divisors (15261254).

21365722 is a wasteful number, since it uses less digits than its factorization.

21365722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526132.

The product of its digits is 5040, while the sum is 28.

The square root of 21365722 is about 4622.3069997567. The cubic root of 21365722 is about 277.4847953144.

The spelling of 21365722 in words is "twenty-one million, three hundred sixty-five thousand, seven hundred twenty-two".