21466746 has 24 divisors (see below), whose sum is σ = 53156064. Its totient is φ = 6133320.

The previous prime is 21466729. The next prime is 21466747. The reversal of 21466746 is 64766412.

It is a self number, because there is not a number n which added to its sum of digits gives 21466746.

It is not an unprimeable number, because it can be changed into a prime (21466747) 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, 85060 + ... + 85311.

It is an arithmetic number, because the mean of its divisors is an integer number (2214836).

Almost surely, 2^21466746 is an apocalyptic number.

21466746 is an abundant number, since it is smaller than the sum of its proper divisors (31689318).

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

21466746 is a wasteful number, since it uses less digits than its factorization.

21466746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170386 (or 170383 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 21466746 is about 4633.2219890698. The cubic root of 21466746 is about 277.9214535785.

The spelling of 21466746 in words is "twenty-one million, four hundred sixty-six thousand, seven hundred forty-six".