21766130 has 8 divisors (see below), whose sum is σ = 39179052. Its totient is φ = 8706448.

The previous prime is 21766099. The next prime is 21766139. The reversal of 21766130 is 3166712.

It can be written as a sum of positive squares in 2 ways, for example, as 21724921 + 41209 = 4661^2 + 203^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21766130.

It is not an unprimeable number, because it can be changed into a prime (21766139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088297 + ... + 1088316.

Almost surely, 2^21766130 is an apocalyptic number.

21766130 is a deficient number, since it is larger than the sum of its proper divisors (17412922).

21766130 is a wasteful number, since it uses less digits than its factorization.

21766130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176620.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21766130 is about 4665.4185235625. The cubic root of 21766130 is about 279.2074954269.

The spelling of 21766130 in words is "twenty-one million, seven hundred sixty-six thousand, one hundred thirty".