21692068 has 12 divisors (see below), whose sum is σ = 40194252. Its totient is φ = 10208000.

The previous prime is 21692063. The next prime is 21692071. The reversal of 21692068 is 86029612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8573184 + 13118884 = 2928^2 + 3622^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (21692063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159433 + ... + 159568.

It is an arithmetic number, because the mean of its divisors is an integer number (3349521).

Almost surely, 2^21692068 is an apocalyptic number.

It is an amenable number.

21692068 is a deficient number, since it is larger than the sum of its proper divisors (18502184).

21692068 is a wasteful number, since it uses less digits than its factorization.

21692068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319022 (or 319020 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 21692068 is about 4657.4744229035. The cubic root of 21692068 is about 278.8904560039.

The spelling of 21692068 in words is "twenty-one million, six hundred ninety-two thousand, sixty-eight".