21913835 has 8 divisors (see below), whose sum is σ = 26489376. Its totient is φ = 17402560.

The previous prime is 21913831. The next prime is 21913849. The reversal of 21913835 is 53831912.

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

It is not a de Polignac number, because 21913835 - 2² = 21913831 is a prime.

It is a super-3 number, since 3×21913835³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21913831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15311 + ... + 16680.

It is an arithmetic number, because the mean of its divisors is an integer number (3311172).

Almost surely, 2^21913835 is an apocalyptic number.

21913835 is a deficient number, since it is larger than the sum of its proper divisors (4575541).

21913835 is a wasteful number, since it uses less digits than its factorization.

21913835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32133.

The product of its digits is 6480, while the sum is 32.

The square root of 21913835 is about 4681.2215286184. The cubic root of 21913835 is about 279.8376397158.

The spelling of 21913835 in words is "twenty-one million, nine hundred thirteen thousand, eight hundred thirty-five".