21106552123 has 8 divisors (see below), whose sum is σ = 21424002848. Its totient is φ = 20789866944.

The previous prime is 21106552109. The next prime is 21106552139. The reversal of 21106552123 is 32125560112.

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 21106552123 - 2⁵ = 21106552091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21106552091 and 21106552100.

It is not an unprimeable number, because it can be changed into a prime (21106552153) 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, 135711 + ... + 246232.

It is an arithmetic number, because the mean of its divisors is an integer number (2678000356).

Almost surely, 2^21106552123 is an apocalyptic number.

21106552123 is a deficient number, since it is larger than the sum of its proper divisors (317450725).

21106552123 is an equidigital number, since it uses as much as digits as its factorization.

21106552123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382773.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 21106552123 in words is "twenty-one billion, one hundred six million, five hundred fifty-two thousand, one hundred twenty-three".