21367722 has 32 divisors (see below), whose sum is σ = 45417600. Its totient is φ = 6689088.

The previous prime is 21367721. The next prime is 21367729. The reversal of 21367722 is 22776312.

It is a self number, because there is not a number n which added to its sum of digits gives 21367722.

It is not an unprimeable number, because it can be changed into a prime (21367721) 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 15 ways as a sum of consecutive naturals, for example, 4779 + ... + 8097.

It is an arithmetic number, because the mean of its divisors is an integer number (1419300).

Almost surely, 2^21367722 is an apocalyptic number.

21367722 is an abundant number, since it is smaller than the sum of its proper divisors (24049878).

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

21367722 is a wasteful number, since it uses less digits than its factorization.

21367722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390.

The product of its digits is 7056, while the sum is 30.

The square root of 21367722 is about 4622.5233368800. The cubic root of 21367722 is about 277.4934532990.

The spelling of 21367722 in words is "twenty-one million, three hundred sixty-seven thousand, seven hundred twenty-two".