21692066 has 16 divisors (see below), whose sum is σ = 35671968. Its totient is φ = 9811200.

The previous prime is 21692063. The next prime is 21692071. The reversal of 21692066 is 66029612.

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 7 ways as a sum of consecutive naturals, for example, 2306 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (2229498).

Almost surely, 2^21692066 is an apocalyptic number.

21692066 is a deficient number, since it is larger than the sum of its proper divisors (13979902).

21692066 is a wasteful number, since it uses less digits than its factorization.

21692066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4897.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 21692066 is about 4657.4742081948. The cubic root of 21692066 is about 278.8904474327.

The spelling of 21692066 in words is "twenty-one million, six hundred ninety-two thousand, sixty-six".