21936635 has 8 divisors (see below), whose sum is σ = 30084576. Its totient is φ = 15042240.

The previous prime is 21936611. The next prime is 21936661. The reversal of 21936635 is 53663912.

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

It is not a de Polignac number, because 21936635 - 2⁶ = 21936571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 626761 = 21936635 / (2 + 1 + 9 + 3 + 6 + 6 + 3 + 5).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21936595 and 21936604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313346 + ... + 313415.

It is an arithmetic number, because the mean of its divisors is an integer number (3760572).

Almost surely, 2^21936635 is an apocalyptic number.

21936635 is a deficient number, since it is larger than the sum of its proper divisors (8147941).

21936635 is an equidigital number, since it uses as much as digits as its factorization.

21936635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626773.

The product of its digits is 29160, while the sum is 35.

The square root of 21936635 is about 4683.6561573198. The cubic root of 21936635 is about 279.9346573715.

The spelling of 21936635 in words is "twenty-one million, nine hundred thirty-six thousand, six hundred thirty-five".