21960786 has 8 divisors (see below), whose sum is σ = 43921584. Its totient is φ = 7320260.

The previous prime is 21960781. The next prime is 21960811. The reversal of 21960786 is 68706912.

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

21960786 is an admirable number.

It is a super-2 number, since 2×21960786² = 964552243475592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21960781) 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, 1830060 + ... + 1830071.

It is an arithmetic number, because the mean of its divisors is an integer number (5490198).

Almost surely, 2^21960786 is an apocalyptic number.

21960786 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21960786 is a wasteful number, since it uses less digits than its factorization.

21960786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660136.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 21960786 is about 4686.2336689499. The cubic root of 21960786 is about 280.0373504596.

The spelling of 21960786 in words is "twenty-one million, nine hundred sixty thousand, seven hundred eighty-six".