21223103121 has 12 divisors (see below), whose sum is σ = 33442465680. Its totient is φ = 12862486680.

The previous prime is 21223103117. The next prime is 21223103123. The reversal of 21223103121 is 12130132212.

21223103121 is a `hidden beast` number, since 21 + 22 + 310 + 312 + 1 = 666.

It is not a de Polignac number, because 21223103121 - 2² = 21223103117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223103094 and 21223103103.

It is not an unprimeable number, because it can be changed into a prime (21223103123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107187291 + ... + 107187488.

It is an arithmetic number, because the mean of its divisors is an integer number (2786872140).

Almost surely, 2^21223103121 is an apocalyptic number.

It is an amenable number.

21223103121 is a deficient number, since it is larger than the sum of its proper divisors (12219362559).

21223103121 is a wasteful number, since it uses less digits than its factorization.

21223103121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214374796 (or 214374793 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21223103121 its reverse (12130132212), we get a palindrome (33353235333).

The spelling of 21223103121 in words is "twenty-one billion, two hundred twenty-three million, one hundred three thousand, one hundred twenty-one".