1212111222201 has 24 divisors (see below), whose sum is σ = 1910031726720. Its totient is φ = 734598136800.

The previous prime is 1212111222191. The next prime is 1212111222269. The reversal of 1212111222201 is 1022221112121.

It is not a de Polignac number, because 1212111222201 - 2⁷ = 1212111222073 is a prime.

It is a super-2 number, since 2×1212111222201² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212111222001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6808560 + ... + 6984318.

It is an arithmetic number, because the mean of its divisors is an integer number (79584655280).

Almost surely, 2^{1212111222201} is an apocalyptic number.

1212111222201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212111222201 is a deficient number, since it is larger than the sum of its proper divisors (697920504519).

1212111222201 is a wasteful number, since it uses less digits than its factorization.

1212111222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245437 (or 245434 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212111222201 its reverse (1022221112121), we get a palindrome (2234332334322).

The spelling of 1212111222201 in words is "one trillion, two hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, two hundred one".