21694202 has 4 divisors (see below), whose sum is σ = 32541306. Its totient is φ = 10847100.

The previous prime is 21694201. The next prime is 21694217. The reversal of 21694202 is 20249612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20529961 + 1164241 = 4531^2 + 1079^2 .

It is not an unprimeable number, because it can be changed into a prime (21694201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5423549 + ... + 5423552.

Almost surely, 2^21694202 is an apocalyptic number.

21694202 is a deficient number, since it is larger than the sum of its proper divisors (10847104).

21694202 is a wasteful number, since it uses less digits than its factorization.

21694202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10847103.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21694202 is about 4657.7035113884. The cubic root of 21694202 is about 278.8996011704.

The spelling of 21694202 in words is "twenty-one million, six hundred ninety-four thousand, two hundred two".