21106102123 has 8 divisors (see below), whose sum is σ = 22361154192. Its totient is φ = 19852551936.

The previous prime is 21106102117. The next prime is 21106102133. The reversal of 21106102123 is 32120160112.

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 21106102123 - 2²⁹ = 20569231211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21106102123.

It is not an unprimeable number, because it can be changed into a prime (21106102133) 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, 346465 + ... + 402802.

It is an arithmetic number, because the mean of its divisors is an integer number (2795144274).

Almost surely, 2^21106102123 is an apocalyptic number.

21106102123 is a deficient number, since it is larger than the sum of its proper divisors (1255052069).

21106102123 is a wasteful number, since it uses less digits than its factorization.

21106102123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750941.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21106102123 its reverse (32120160112), we get a palindrome (53226262235).

The spelling of 21106102123 in words is "twenty-one billion, one hundred six million, one hundred two thousand, one hundred twenty-three".