21695124 has 24 divisors (see below), whose sum is σ = 55224288. Its totient is φ = 6574240.

The previous prime is 21695099. The next prime is 21695129. The reversal of 21695124 is 42159612.

It is a junction number, because it is equal to n+sod(n) for n = 21695091 and 21695100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21695129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82047 + ... + 82310.

It is an arithmetic number, because the mean of its divisors is an integer number (2301012).

Almost surely, 2^21695124 is an apocalyptic number.

It is an amenable number.

21695124 is an abundant number, since it is smaller than the sum of its proper divisors (33529164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21695124 is a wasteful number, since it uses less digits than its factorization.

21695124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164375 (or 164373 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 21695124 is about 4657.8024861516. The cubic root of 21695124 is about 278.9035521767.

The spelling of 21695124 in words is "twenty-one million, six hundred ninety-five thousand, one hundred twenty-four".