21115230155 has 8 divisors (see below), whose sum is σ = 26439940512. Its totient is φ = 16157741248.

The previous prime is 21115230151. The next prime is 21115230179. The reversal of 21115230155 is 55103251112.

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 21115230155 - 2² = 21115230151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21115230151) 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 7 ways as a sum of consecutive naturals, for example, 91805234 + ... + 91805463.

It is an arithmetic number, because the mean of its divisors is an integer number (3304992564).

Almost surely, 2^21115230155 is an apocalyptic number.

21115230155 is a deficient number, since it is larger than the sum of its proper divisors (5324710357).

21115230155 is a wasteful number, since it uses less digits than its factorization.

21115230155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183610725.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 21115230155 its reverse (55103251112), we get a palindrome (76218481267).

The spelling of 21115230155 in words is "twenty-one billion, one hundred fifteen million, two hundred thirty thousand, one hundred fifty-five".