21012002222123 has 8 divisors (see below), whose sum is σ = 22924247021616. Its totient is φ = 19100101219200.

The previous prime is 21012002222117. The next prime is 21012002222171. The reversal of 21012002222123 is 32122220021012.

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 21012002222123 - 2¹⁰ = 21012002221099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012002222095 and 21012002222104.

It is not an unprimeable number, because it can be changed into a prime (21012002221123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85821338 + ... + 86065823.

It is an arithmetic number, because the mean of its divisors is an integer number (2865530877702).

Almost surely, 2^{21012002222123} is an apocalyptic number.

21012002222123 is a deficient number, since it is larger than the sum of its proper divisors (1912244799493).

21012002222123 is a wasteful number, since it uses less digits than its factorization.

21012002222123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171898285.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21012002222123 its reverse (32122220021012), we get a palindrome (53134222243135).

The spelling of 21012002222123 in words is "twenty-one trillion, twelve billion, two million, two hundred twenty-two thousand, one hundred twenty-three".