21962166 has 16 divisors (see below), whose sum is σ = 44071104. Its totient is φ = 7296264.

The previous prime is 21962107. The next prime is 21962173. The reversal of 21962166 is 66126912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4120 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (2754444).

Almost surely, 2^21962166 is an apocalyptic number.

21962166 is an abundant number, since it is smaller than the sum of its proper divisors (22108938).

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

21962166 is a wasteful number, since it uses less digits than its factorization.

21962166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12235.

The product of its digits is 7776, while the sum is 33.

The square root of 21962166 is about 4686.3809064138. The cubic root of 21962166 is about 280.0432161187.

The spelling of 21962166 in words is "twenty-one million, nine hundred sixty-two thousand, one hundred sixty-six".