21960086 has 8 divisors (see below), whose sum is σ = 34673880. Its totient is φ = 10402128.

The previous prime is 21960083. The next prime is 21960091. The reversal of 21960086 is 68006912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21960083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288911 + ... + 288986.

It is an arithmetic number, because the mean of its divisors is an integer number (4334235).

Almost surely, 2^21960086 is an apocalyptic number.

21960086 is a deficient number, since it is larger than the sum of its proper divisors (12713794).

21960086 is a wasteful number, since it uses less digits than its factorization.

21960086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577918.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 21960086 is about 4686.1589815114. The cubic root of 21960086 is about 280.0343750314.

Adding to 21960086 its reverse (68006912), we get a palindrome (89966998).

The spelling of 21960086 in words is "twenty-one million, nine hundred sixty thousand, eighty-six".