123213221021 has 4 divisors (see below), whose sum is σ = 134414422944. Its totient is φ = 112012019100.

The previous prime is 123213220967. The next prime is 123213221057. The reversal of 123213221021 is 120122312321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123213221021 - 2²⁶ = 123146112157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123213220984 and 123213221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123213221071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5600600945 + ... + 5600600966.

It is an arithmetic number, because the mean of its divisors is an integer number (33603605736).

Almost surely, 2^123213221021 is an apocalyptic number.

123213221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123213221021 is a deficient number, since it is larger than the sum of its proper divisors (11201201923).

123213221021 is a wasteful number, since it uses less digits than its factorization.

123213221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11201201922.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 123213221021 its reverse (120122312321), we get a palindrome (243335533342).

The spelling of 123213221021 in words is "one hundred twenty-three billion, two hundred thirteen million, two hundred twenty-one thousand, twenty-one".