21535822 has 24 divisors (see below), whose sum is σ = 40583088. Its totient is φ = 8389920.

The previous prime is 21535781. The next prime is 21535837. The reversal of 21535822 is 22853512.

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 11 ways as a sum of consecutive naturals, for example, 4663 + ... + 8050.

It is an arithmetic number, because the mean of its divisors is an integer number (1690962).

Almost surely, 2^21535822 is an apocalyptic number.

21535822 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21535822 is a deficient number, since it is larger than the sum of its proper divisors (19047266).

21535822 is a wasteful number, since it uses less digits than its factorization.

21535822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12744 (or 12733 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 21535822 is about 4640.6704257036. The cubic root of 21535822 is about 278.2192342717.

The spelling of 21535822 in words is "twenty-one million, five hundred thirty-five thousand, eight hundred twenty-two".