21964935 has 16 divisors (see below), whose sum is σ = 37211616. Its totient is φ = 11025408.

The previous prime is 21964903. The next prime is 21964937. The reversal of 21964935 is 53946912.

It is not a de Polignac number, because 21964935 - 2⁵ = 21964903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21964893 and 21964902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21964937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42814 + ... + 43323.

It is an arithmetic number, because the mean of its divisors is an integer number (2325726).

Almost surely, 2^21964935 is an apocalyptic number.

21964935 is a deficient number, since it is larger than the sum of its proper divisors (15246681).

21964935 is a wasteful number, since it uses less digits than its factorization.

21964935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86162.

The product of its digits is 58320, while the sum is 39.

The square root of 21964935 is about 4686.6763276335. The cubic root of 21964935 is about 280.0549849499.

The spelling of 21964935 in words is "twenty-one million, nine hundred sixty-four thousand, nine hundred thirty-five".