21155002552123 has 8 divisors (see below), whose sum is σ = 23641067154096. Its totient is φ = 18762751708800.

The previous prime is 21155002552039. The next prime is 21155002552133. The reversal of 21155002552123 is 32125520055112.

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

It is not a de Polignac number, because 21155002552123 - 2⁴¹ = 18955979296571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21155002552133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23453439186 + ... + 23453440087.

It is an arithmetic number, because the mean of its divisors is an integer number (2955133394262).

Almost surely, 2^{21155002552123} is an apocalyptic number.

21155002552123 is a deficient number, since it is larger than the sum of its proper divisors (2486064601973).

21155002552123 is a wasteful number, since it uses less digits than its factorization.

21155002552123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46906879325.

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 21155002552123 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred fifty-two thousand, one hundred twenty-three".