21466026 has 16 divisors (see below), whose sum is σ = 47702400. Its totient is φ = 7155324.

The previous prime is 21466021. The next prime is 21466037. The reversal of 21466026 is 62066412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21466021) 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 in 7 ways as a sum of consecutive naturals, for example, 198706 + ... + 198813.

It is an arithmetic number, because the mean of its divisors is an integer number (2981400).

Almost surely, 2^21466026 is an apocalyptic number.

21466026 is an abundant number, since it is smaller than the sum of its proper divisors (26236374).

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

21466026 is a wasteful number, since it uses less digits than its factorization.

21466026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397530 (or 397524 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21466026 is about 4633.1442887093. The cubic root of 21466026 is about 277.9183463589.

The spelling of 21466026 in words is "twenty-one million, four hundred sixty-six thousand, twenty-six".