1212122222001 has 48 divisors (see below), whose sum is σ = 1775183604480. Its totient is φ = 796898995200.

The previous prime is 1212122221997. The next prime is 1212122222011. The reversal of 1212122222001 is 1002222212121.

It is a happy number.

It is not a de Polignac number, because 1212122222001 - 2² = 1212122221997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212122222011) 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 47 ways as a sum of consecutive naturals, for example, 930254316 + ... + 930255618.

It is an arithmetic number, because the mean of its divisors is an integer number (36982991760).

Almost surely, 2^{1212122222001} is an apocalyptic number.

It is an amenable number.

1212122222001 is a deficient number, since it is larger than the sum of its proper divisors (563061382479).

1212122222001 is a wasteful number, since it uses less digits than its factorization.

1212122222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566 (or 3563 counting only the distinct ones).

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

Adding to 1212122222001 its reverse (1002222212121), we get a palindrome (2214344434122).

The spelling of 1212122222001 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty-two thousand, one".