21486545 has 16 divisors (see below), whose sum is σ = 26265600. Its totient is φ = 16872000.

The previous prime is 21486539. The next prime is 21486551. The reversal of 21486545 is 54568412.

It is an interprime number because it is at equal distance from previous prime (21486539) and next prime (21486551).

It is not a de Polignac number, because 21486545 - 2²⁰ = 20437969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112400 + ... + 112590.

It is an arithmetic number, because the mean of its divisors is an integer number (1641600).

Almost surely, 2^21486545 is an apocalyptic number.

It is an amenable number.

21486545 is a deficient number, since it is larger than the sum of its proper divisors (4779055).

21486545 is a wasteful number, since it uses less digits than its factorization.

21486545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496.

The product of its digits is 38400, while the sum is 35.

The square root of 21486545 is about 4635.3581307165. The cubic root of 21486545 is about 278.0068705926.

The spelling of 21486545 in words is "twenty-one million, four hundred eighty-six thousand, five hundred forty-five".