1212221120121 has 40 divisors (see below), whose sum is σ = 2091675684384. Its totient is φ = 691463018880.

The previous prime is 1212221120107. The next prime is 1212221120177. The reversal of 1212221120121 is 1210211222121.

It is not a de Polignac number, because 1212221120121 - 2⁶ = 1212221120057 is a prime.

It is a super-2 number, since 2×1212221120121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212221120094 and 1212221120103.

It is not an unprimeable number, because it can be changed into a prime (1212221120101) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 40000075 + ... + 40030368.

Almost surely, 2^{1212221120121} is an apocalyptic number.

1212221120121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212221120121 is a deficient number, since it is larger than the sum of its proper divisors (879454564263).

1212221120121 is a wasteful number, since it uses less digits than its factorization.

1212221120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80030483 (or 80030474 counting only the distinct ones).

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

Adding to 1212221120121 its reverse (1210211222121), we get a palindrome (2422432342242).

The spelling of 1212221120121 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".