1212123220203 has 32 divisors (see below), whose sum is σ = 1889493811200. Its totient is φ = 676772722080.

The previous prime is 1212123220157. The next prime is 1212123220211. The reversal of 1212123220203 is 3020223212121.

It is not a de Polignac number, because 1212123220203 - 2²⁵ = 1212089665771 is a prime.

It is a super-2 number, since 2×1212123220203² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1212123220203.

It is not an unprimeable number, because it can be changed into a prime (1212123220003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433903 + ... + 1616328.

It is an arithmetic number, because the mean of its divisors is an integer number (59046681600).

Almost surely, 2^{1212123220203} is an apocalyptic number.

1212123220203 is a deficient number, since it is larger than the sum of its proper divisors (677370590997).

1212123220203 is a wasteful number, since it uses less digits than its factorization.

1212123220203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050887.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1212123220203 its reverse (3020223212121), we get a palindrome (4232346432324).

The spelling of 1212123220203 in words is "one trillion, two hundred twelve billion, one hundred twenty-three million, two hundred twenty thousand, two hundred three".