21560106 has 8 divisors (see below), whose sum is σ = 43120224. Its totient is φ = 7186700.

The previous prime is 21560087. The next prime is 21560107. The reversal of 21560106 is 60106512.

It is a happy number.

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

21560106 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21560107) 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, 1796670 + ... + 1796681.

It is an arithmetic number, because the mean of its divisors is an integer number (5390028).

Almost surely, 2^21560106 is an apocalyptic number.

21560106 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.

21560106 is a wasteful number, since it uses less digits than its factorization.

21560106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593356.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 21560106 is about 4643.2861208416. The cubic root of 21560106 is about 278.3237692181.

Adding to 21560106 its reverse (60106512), we get a palindrome (81666618).

The spelling of 21560106 in words is "twenty-one million, five hundred sixty thousand, one hundred six".