21486107 has 4 divisors (see below), whose sum is σ = 21503256. Its totient is φ = 21468960.

The previous prime is 21486083. The next prime is 21486119. The reversal of 21486107 is 70168412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21486107 - 2⁶ = 21486043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21486107.

It is not an unprimeable number, because it can be changed into a prime (21486137) 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, 6533 + ... + 9254.

It is an arithmetic number, because the mean of its divisors is an integer number (5375814).

Almost surely, 2^21486107 is an apocalyptic number.

21486107 is a deficient number, since it is larger than the sum of its proper divisors (17149).

21486107 is a wasteful number, since it uses less digits than its factorization.

21486107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17148.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21486107 is about 4635.3108849353. The cubic root of 21486107 is about 278.0049815369.

The spelling of 21486107 in words is "twenty-one million, four hundred eighty-six thousand, one hundred seven".