21222102123 has 24 divisors (see below), whose sum is σ = 31128932016. Its totient is φ = 13930488000.

The previous prime is 21222102107. The next prime is 21222102149. The reversal of 21222102123 is 32120122212.

It is not a de Polignac number, because 21222102123 - 2⁴ = 21222102107 is a prime.

It is a super-2 number, since 2×21222102123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222102096 and 21222102105.

It is not an unprimeable number, because it can be changed into a prime (21222102023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100036 + ... + 229022.

It is an arithmetic number, because the mean of its divisors is an integer number (1297038834).

Almost surely, 2^21222102123 is an apocalyptic number.

21222102123 is a deficient number, since it is larger than the sum of its proper divisors (9906829893).

21222102123 is a wasteful number, since it uses less digits than its factorization.

21222102123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129275 (or 129272 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21222102123 its reverse (32120122212), we get a palindrome (53342224335).

The spelling of 21222102123 in words is "twenty-one billion, two hundred twenty-two million, one hundred two thousand, one hundred twenty-three".