1212030220123 has 4 divisors (see below), whose sum is σ = 1275821284360. Its totient is φ = 1148239155888.

The previous prime is 1212030220103. The next prime is 1212030220127. The reversal of 1212030220123 is 3210220302121.

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 1212030220123 - 2²⁹ = 1211493349211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 63791064217 = 1212030220123 / (1 + 2 + 1 + 2 + 0 + 3 + 0 + 2 + 2 + 0 + 1 + 2 + 3).

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 1212030220123.

It is not an unprimeable number, because it can be changed into a prime (1212030220127) 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, 31895532090 + ... + 31895532127.

It is an arithmetic number, because the mean of its divisors is an integer number (318955321090).

Almost surely, 2^{1212030220123} is an apocalyptic number.

1212030220123 is a deficient number, since it is larger than the sum of its proper divisors (63791064237).

1212030220123 is an equidigital number, since it uses as much as digits as its factorization.

1212030220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63791064236.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1212030220123 its reverse (3210220302121), we get a palindrome (4422250522244).

The spelling of 1212030220123 in words is "one trillion, two hundred twelve billion, thirty million, two hundred twenty thousand, one hundred twenty-three".