1212212201940 has 144 divisors (see below), whose sum is σ = 3823857797760. Its totient is φ = 322355687040.

The previous prime is 1212212201939. The next prime is 1212212202017. The reversal of 1212212201940 is 491022122121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1397350 + ... + 2092130.

It is an arithmetic number, because the mean of its divisors is an integer number (26554568040).

Almost surely, 2^{1212212201940} is an apocalyptic number.

1212212201940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212212201940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1911928898880).

1212212201940 is an abundant number, since it is smaller than the sum of its proper divisors (2611645595820).

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

1212212201940 is a wasteful number, since it uses less digits than its factorization.

1212212201940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695164 (or 695150 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 1212212201940 in words is "one trillion, two hundred twelve billion, two hundred twelve million, two hundred one thousand, nine hundred forty".