21996610 has 8 divisors (see below), whose sum is σ = 39593916. Its totient is φ = 8798640.

The previous prime is 21996599. The next prime is 21996613. The reversal of 21996610 is 1669912.

It can be written as a sum of positive squares in 2 ways, for example, as 20620681 + 1375929 = 4541^2 + 1173^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21996613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099821 + ... + 1099840.

Almost surely, 2^21996610 is an apocalyptic number.

21996610 is a deficient number, since it is larger than the sum of its proper divisors (17597306).

21996610 is a wasteful number, since it uses less digits than its factorization.

21996610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199668.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 21996610 is about 4690.0543706870. The cubic root of 21996610 is about 280.1895400333.

The spelling of 21996610 in words is "twenty-one million, nine hundred ninety-six thousand, six hundred ten".