121220210123 has 2 divisors, whose sum is σ = 121220210124. Its totient is φ = 121220210122.

The previous prime is 121220210107. The next prime is 121220210141. The reversal of 121220210123 is 321012022121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220210123 - 2⁴ = 121220210107 is a prime.

It is not a weakly prime, because it can be changed into another prime (121220218123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610105061 + 60610105062.

It is an arithmetic number, because the mean of its divisors is an integer number (60610105062).

Almost surely, 2^121220210123 is an apocalyptic number.

121220210123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220210123 is an equidigital number, since it uses as much as digits as its factorization.

121220210123 is an evil number, because the sum of its binary digits is even.

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

Adding to 121220210123 its reverse (321012022121), we get a palindrome (442232232244).

The spelling of 121220210123 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-three".