21695036 has 24 divisors (see below), whose sum is σ = 43599360. Its totient is φ = 9342000.

The previous prime is 21695021. The next prime is 21695057. The reversal of 21695036 is 63059612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21694993 and 21695011.

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, 12140 + ... + 13811.

It is an arithmetic number, because the mean of its divisors is an integer number (1816640).

Almost surely, 2^21695036 is an apocalyptic number.

It is an amenable number.

21695036 is an abundant number, since it is smaller than the sum of its proper divisors (21904324).

21695036 is a wasteful number, since it uses less digits than its factorization.

21695036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25985 (or 25983 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 21695036 is about 4657.7930396272. The cubic root of 21695036 is about 278.9031750790.

The spelling of 21695036 in words is "twenty-one million, six hundred ninety-five thousand, thirty-six".