1212161975999 has 48 divisors (see below), whose sum is σ = 1409356609920. Its totient is φ = 1038310041600.

The previous prime is 1212161975951. The next prime is 1212161976001. The reversal of 1212161975999 is 9995791612121.

It is a happy number.

It is not a de Polignac number, because 1212161975999 - 2¹² = 1212161971903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212161975909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 180889349 + ... + 180896049.

It is an arithmetic number, because the mean of its divisors is an integer number (29361596040).

Almost surely, 2^{1212161975999} is an apocalyptic number.

1212161975999 is a deficient number, since it is larger than the sum of its proper divisors (197194633921).

1212161975999 is a wasteful number, since it uses less digits than its factorization.

1212161975999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7620 (or 7607 counting only the distinct ones).

The product of its digits is 5511240, while the sum is 62.

The spelling of 1212161975999 in words is "one trillion, two hundred twelve billion, one hundred sixty-one million, nine hundred seventy-five thousand, nine hundred ninety-nine".