1213200121221 has 256 divisors, whose sum is σ = 2254417920000. Its totient is φ = 635199667200.

The previous prime is 1213200121207. The next prime is 1213200121223. The reversal of 1213200121221 is 1221210023121.

1213200121221 is a `hidden beast` number, since 1 + 2 + 1 + 320 + 0 + 121 + 221 = 666.

It is not a de Polignac number, because 1213200121221 - 2³⁰ = 1212126379397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213200121194 and 1213200121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213200121223) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 401853450 + ... + 401856468.

It is an arithmetic number, because the mean of its divisors is an integer number (8806320000).

Almost surely, 2^{1213200121221} is an apocalyptic number.

1213200121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213200121221 is a deficient number, since it is larger than the sum of its proper divisors (1041217798779).

1213200121221 is a wasteful number, since it uses less digits than its factorization.

1213200121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205 (or 3199 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1213200121221 its reverse (1221210023121), we get a palindrome (2434410144342).

The spelling of 1213200121221 in words is "one trillion, two hundred thirteen billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-one".