1321123111212 has 24 divisors (see below), whose sum is σ = 3154309445056. Its totient is φ = 430133105808.

The previous prime is 1321123111211. The next prime is 1321123111283. The reversal of 1321123111212 is 2121113211231.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1321123111211) 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, 1280157538 + ... + 1280158569.

Almost surely, 2^{1321123111212} is an apocalyptic number.

1321123111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321123111212 is an abundant number, since it is smaller than the sum of its proper divisors (1833186333844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321123111212 is a wasteful number, since it uses less digits than its factorization.

1321123111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560316157 (or 2560316155 counting only the distinct ones).

The product of its digits is 144, while the sum is 21.

Adding to 1321123111212 its reverse (2121113211231), we get a palindrome (3442236322443).

The spelling of 1321123111212 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-three million, one hundred eleven thousand, two hundred twelve".