21211102123 has 8 divisors (see below), whose sum is σ = 21374115840. Its totient is φ = 21048237480.

The previous prime is 21211102091. The next prime is 21211102127. The reversal of 21211102123 is 32120111212.

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 21211102123 - 2⁵ = 21211102091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211102097 and 21211102106.

It is not an unprimeable number, because it can be changed into a prime (21211102127) 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, 257286 + ... + 329572.

It is an arithmetic number, because the mean of its divisors is an integer number (2671764480).

Almost surely, 2^21211102123 is an apocalyptic number.

21211102123 is a deficient number, since it is larger than the sum of its proper divisors (163013717).

21211102123 is a wasteful number, since it uses less digits than its factorization.

21211102123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74537.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21211102123 its reverse (32120111212), we get a palindrome (53331213335).

The spelling of 21211102123 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand, one hundred twenty-three".