21536022 has 16 divisors (see below), whose sum is σ = 43662960. Its totient is φ = 7080192.

The previous prime is 21535993. The next prime is 21536033. The reversal of 21536022 is 22063512.

It is a self number, because there is not a number n which added to its sum of digits gives 21536022.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24147 + ... + 25022.

It is an arithmetic number, because the mean of its divisors is an integer number (2728935).

Almost surely, 2^21536022 is an apocalyptic number.

21536022 is an abundant number, since it is smaller than the sum of its proper divisors (22126938).

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

21536022 is a wasteful number, since it uses less digits than its factorization.

21536022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49247.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21536022 is about 4640.6919742642. The cubic root of 21536022 is about 278.2200955294.

Adding to 21536022 its reverse (22063512), we get a palindrome (43599534).

The spelling of 21536022 in words is "twenty-one million, five hundred thirty-six thousand, twenty-two".