21416766 has 32 divisors (see below), whose sum is σ = 49109760. Its totient is φ = 6099456.

The previous prime is 21416737. The next prime is 21416779. The reversal of 21416766 is 66761412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16990 + ... + 18206.

It is an arithmetic number, because the mean of its divisors is an integer number (1534680).

Almost surely, 2^21416766 is an apocalyptic number.

21416766 is an abundant number, since it is smaller than the sum of its proper divisors (27692994).

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

21416766 is a wasteful number, since it uses less digits than its factorization.

21416766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648.

The product of its digits is 12096, while the sum is 33.

The square root of 21416766 is about 4627.8251911670. The cubic root of 21416766 is about 277.7055955498.

The spelling of 21416766 in words is "twenty-one million, four hundred sixteen thousand, seven hundred sixty-six".