123220210121 has 8 divisors (see below), whose sum is σ = 124344310464. Its totient is φ = 122098890160.

The previous prime is 123220210117. The next prime is 123220210151. The reversal of 123220210121 is 121012022321.

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 123220210121 - 2² = 123220210117 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 123220210121.

It is not an unprimeable number, because it can be changed into a prime (123220210151) 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, 606005 + ... + 783378.

It is an arithmetic number, because the mean of its divisors is an integer number (15543038808).

Almost surely, 2^123220210121 is an apocalyptic number.

It is an amenable number.

123220210121 is a deficient number, since it is larger than the sum of its proper divisors (1124100343).

123220210121 is a wasteful number, since it uses less digits than its factorization.

123220210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390191.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 123220210121 its reverse (121012022321), we get a palindrome (244232232442).

The spelling of 123220210121 in words is "one hundred twenty-three billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-one".