21100434554 has 8 divisors (see below), whose sum is σ = 33026767200. Its totient is φ = 10091512156.

The previous prime is 21100434529. The next prime is 21100434559. The reversal of 21100434554 is 45543400112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21100434559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229352504 + ... + 229352595.

It is an arithmetic number, because the mean of its divisors is an integer number (4128345900).

Almost surely, 2^21100434554 is an apocalyptic number.

21100434554 is a deficient number, since it is larger than the sum of its proper divisors (11926332646).

21100434554 is a wasteful number, since it uses less digits than its factorization.

21100434554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458705124.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21100434554 its reverse (45543400112), we get a palindrome (66643834666).

The spelling of 21100434554 in words is "twenty-one billion, one hundred million, four hundred thirty-four thousand, five hundred fifty-four".