121220210200123 has 4 divisors (see below), whose sum is σ = 121220903050168. Its totient is φ = 121219517350080.

The previous prime is 121220210200079. The next prime is 121220210200171. The reversal of 121220210200123 is 321002012022121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121220210200123 - 2²⁵ = 121220176645691 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 121220210200123.

It is not an unprimeable number, because it can be changed into a prime (121220210200183) 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, 346162518 + ... + 346512523.

It is an arithmetic number, because the mean of its divisors is an integer number (30305225762542).

Almost surely, 2^{121220210200123} is an apocalyptic number.

121220210200123 is a deficient number, since it is larger than the sum of its proper divisors (692850045).

121220210200123 is an equidigital number, since it uses as much as digits as its factorization.

121220210200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692850044.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 121220210200123 its reverse (321002012022121), we get a palindrome (442222222222244).

The spelling of 121220210200123 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred ten million, two hundred thousand, one hundred twenty-three".