21485065 has 16 divisors (see below), whose sum is σ = 29745792. Its totient is φ = 14592384.

The previous prime is 21485053. The next prime is 21485069. The reversal of 21485065 is 56058412.

It is a cyclic number.

It is not a de Polignac number, because 21485065 - 2⁵ = 21485033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21485069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 877 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (1859112).

Almost surely, 2^21485065 is an apocalyptic number.

It is an amenable number.

21485065 is a deficient number, since it is larger than the sum of its proper divisors (8260727).

21485065 is a wasteful number, since it uses less digits than its factorization.

21485065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 21485065 is about 4635.1984855020. The cubic root of 21485065 is about 278.0004873790. Note that the first 3 decimals are identical.

The spelling of 21485065 in words is "twenty-one million, four hundred eighty-five thousand, sixty-five".