21534335145 has 48 divisors (see below), whose sum is σ = 38219980032. Its totient is φ = 11213112960.

The previous prime is 21534335117. The next prime is 21534335171. The reversal of 21534335145 is 54153343512.

21534335145 is a `hidden beast` number, since 2 + 1 + 534 + 33 + 51 + 45 = 666.

It is not a de Polignac number, because 21534335145 - 2⁸ = 21534334889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296367 + ... + 361803.

It is an arithmetic number, because the mean of its divisors is an integer number (796249584).

Almost surely, 2^21534335145 is an apocalyptic number.

It is an amenable number.

21534335145 is a deficient number, since it is larger than the sum of its proper divisors (16685644887).

21534335145 is a wasteful number, since it uses less digits than its factorization.

21534335145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65622 (or 65619 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

Adding to 21534335145 its reverse (54153343512), we get a palindrome (75687678657).

The spelling of 21534335145 in words is "twenty-one billion, five hundred thirty-four million, three hundred thirty-five thousand, one hundred forty-five".