21145133104 has 20 divisors (see below), whose sum is σ = 41114500200. Its totient is φ = 10534939520.

The previous prime is 21145133089. The next prime is 21145133129. The reversal of 21145133104 is 40133154112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2347054 + ... + 2356045.

It is an arithmetic number, because the mean of its divisors is an integer number (2055725010).

Almost surely, 2^21145133104 is an apocalyptic number.

It is an amenable number.

21145133104 is a deficient number, since it is larger than the sum of its proper divisors (19969367096).

21145133104 is a wasteful number, since it uses less digits than its factorization.

21145133104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703388 (or 4703382 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21145133104 its reverse (40133154112), we get a palindrome (61278287216).

The spelling of 21145133104 in words is "twenty-one billion, one hundred forty-five million, one hundred thirty-three thousand, one hundred four".