21523103155 has 8 divisors (see below), whose sum is σ = 26377250112. Its totient is φ = 16852131648.

The previous prime is 21523103143. The next prime is 21523103209. The reversal of 21523103155 is 55130132512.

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

It is a cyclic number.

It is not a de Polignac number, because 21523103155 - 2⁵ = 21523103123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45793602 + ... + 45794071.

It is an arithmetic number, because the mean of its divisors is an integer number (3297156264).

Almost surely, 2^21523103155 is an apocalyptic number.

21523103155 is a deficient number, since it is larger than the sum of its proper divisors (4854146957).

21523103155 is an equidigital number, since it uses as much as digits as its factorization.

21523103155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91587725.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 21523103155 its reverse (55130132512), we get a palindrome (76653235667).

The spelling of 21523103155 in words is "twenty-one billion, five hundred twenty-three million, one hundred three thousand, one hundred fifty-five".