21120004353 has 48 divisors (see below), whose sum is σ = 33846756864. Its totient is φ = 11668043520.

The previous prime is 21120004351. The next prime is 21120004361. The reversal of 21120004353 is 35340002112.

It is not a de Polignac number, because 21120004353 - 2¹ = 21120004351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21120004351) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7549551 + ... + 7552347.

It is an arithmetic number, because the mean of its divisors is an integer number (705140768).

Almost surely, 2^21120004353 is an apocalyptic number.

It is an amenable number.

21120004353 is a deficient number, since it is larger than the sum of its proper divisors (12726752511).

21120004353 is a wasteful number, since it uses less digits than its factorization.

21120004353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502 (or 4495 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21120004353 its reverse (35340002112), we get a palindrome (56460006465).

The spelling of 21120004353 in words is "twenty-one billion, one hundred twenty million, four thousand, three hundred fifty-three".