21130443555 has 16 divisors (see below), whose sum is σ = 36409380000. Its totient is φ = 10402679808.

The previous prime is 21130443517. The next prime is 21130443559. The reversal of 21130443555 is 55534403112.

It is not a de Polignac number, because 21130443555 - 2⁷ = 21130443427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21130443559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54180430 + ... + 54180819.

It is an arithmetic number, because the mean of its divisors is an integer number (2275586250).

Almost surely, 2^21130443555 is an apocalyptic number.

21130443555 is a deficient number, since it is larger than the sum of its proper divisors (15278936445).

21130443555 is a wasteful number, since it uses less digits than its factorization.

21130443555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108361270.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 21130443555 its reverse (55534403112), we get a palindrome (76664846667).

The spelling of 21130443555 in words is "twenty-one billion, one hundred thirty million, four hundred forty-three thousand, five hundred fifty-five".