21065011 has 6 divisors (see below), whose sum is σ = 23154236. Its totient is φ = 19149900.

The previous prime is 21065003. The next prime is 21065041. The reversal of 21065011 is 11056012.

It is a happy number.

It is not a de Polignac number, because 21065011 - 2³ = 21065003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21065041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86925 + ... + 87166.

Almost surely, 2^21065011 is an apocalyptic number.

21065011 is a deficient number, since it is larger than the sum of its proper divisors (2089225).

21065011 is a wasteful number, since it uses less digits than its factorization.

21065011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174113 (or 174102 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 21065011 is about 4589.6634952903. The cubic root of 21065011 is about 276.1768234343.

It can be divided in two parts, 2106 and 5011, that added together give a palindrome (7117).

The spelling of 21065011 in words is "twenty-one million, sixty-five thousand, eleven".