21102241155 has 8 divisors (see below), whose sum is σ = 33763585872. Its totient is φ = 11254528608.

The previous prime is 21102241093. The next prime is 21102241157. The reversal of 21102241155 is 55114220112.

It is a happy number.

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

It is not a de Polignac number, because 21102241155 - 2¹² = 21102237059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102241157) by changing a digit.

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, 703408024 + ... + 703408053.

It is an arithmetic number, because the mean of its divisors is an integer number (4220448234).

Almost surely, 2^21102241155 is an apocalyptic number.

21102241155 is a deficient number, since it is larger than the sum of its proper divisors (12661344717).

21102241155 is a wasteful number, since it uses less digits than its factorization.

21102241155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406816085.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 21102241155 its reverse (55114220112), we get a palindrome (76216461267).

The spelling of 21102241155 in words is "twenty-one billion, one hundred two million, two hundred forty-one thousand, one hundred fifty-five".