1212211222121 has 8 divisors (see below), whose sum is σ = 1218502032000. Its totient is φ = 1205922405600.

The previous prime is 1212211222039. The next prime is 1212211222127. The reversal of 1212211222121 is 1212221122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212211222121 - 2¹⁰ = 1212211221097 is a prime.

It is a super-3 number, since 3×1212211222121³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212211222093 and 1212211222102.

It is not an unprimeable number, because it can be changed into a prime (1212211222127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728885 + ... + 1719213.

It is an arithmetic number, because the mean of its divisors is an integer number (152312754000).

Almost surely, 2^{1212211222121} is an apocalyptic number.

It is an amenable number.

1212211222121 is a deficient number, since it is larger than the sum of its proper divisors (6290809879).

1212211222121 is an equidigital number, since it uses as much as digits as its factorization.

1212211222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996679.

The product of its digits is 128, while the sum is 20.

Adding to 1212211222121 its reverse (1212221122121), we get a palindrome (2424432344242).

The spelling of 1212211222121 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".