21166050 has 24 divisors (see below), whose sum is σ = 52492176. Its totient is φ = 5644240.

The previous prime is 21166009. The next prime is 21166051. The reversal of 21166050 is 5066112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21166051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70404 + ... + 70703.

It is an arithmetic number, because the mean of its divisors is an integer number (2187174).

Almost surely, 2^21166050 is an apocalyptic number.

21166050 is an abundant number, since it is smaller than the sum of its proper divisors (31326126).

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

21166050 is a wasteful number, since it uses less digits than its factorization.

21166050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141122 (or 141117 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 21166050 is about 4600.6575616970. The cubic root of 21166050 is about 276.6176829781.

The spelling of 21166050 in words is "twenty-one million, one hundred sixty-six thousand, fifty".