1212222221001 has 24 divisors (see below), whose sum is σ = 1942544092320. Its totient is φ = 722227924800.

The previous prime is 1212222220987. The next prime is 1212222221027. The reversal of 1212222221001 is 1001222222121.

It is a happy number.

1212222221001 is a `hidden beast` number, since 121 + 222 + 222 + 100 + 1 = 666.

It is not a de Polignac number, because 1212222221001 - 2⁵ = 1212222220969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212222231001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103762540 + ... + 103774221.

It is an arithmetic number, because the mean of its divisors is an integer number (80939337180).

Almost surely, 2^{1212222221001} is an apocalyptic number.

1212222221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212222221001 is a deficient number, since it is larger than the sum of its proper divisors (730321871319).

1212222221001 is a wasteful number, since it uses less digits than its factorization.

1212222221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207536837 (or 207536834 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212222221001 its reverse (1001222222121), we get a palindrome (2213444443122).

The spelling of 1212222221001 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, one".