21435113 has 32 divisors (see below), whose sum is σ = 27371520. Its totient is φ = 16369920.

The previous prime is 21435107. The next prime is 21435133. The reversal of 21435113 is 31153412.

It is not a de Polignac number, because 21435113 - 2⁶ = 21435049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21435133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301868 + ... + 301938.

It is an arithmetic number, because the mean of its divisors is an integer number (855360).

Almost surely, 2^21435113 is an apocalyptic number.

It is an amenable number.

21435113 is a deficient number, since it is larger than the sum of its proper divisors (5936407).

21435113 is a wasteful number, since it uses less digits than its factorization.

21435113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197.

The product of its digits is 360, while the sum is 20.

The square root of 21435113 is about 4629.8070154165. The cubic root of 21435113 is about 277.7848731639.

Adding to 21435113 its reverse (31153412), we get a palindrome (52588525).

The spelling of 21435113 in words is "twenty-one million, four hundred thirty-five thousand, one hundred thirteen".