2121222120201 has 24 divisors (see below), whose sum is σ = 3147132785160. Its totient is φ = 1375781469696.

The previous prime is 2121222120197. The next prime is 2121222120211. The reversal of 2121222120201 is 1020212221212.

It is a happy number.

2121222120201 is a `hidden beast` number, since 2 + 121 + 222 + 120 + 201 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 577972460025 + 1543249660176 = 760245^2 + 1242276^2 .

It is not a de Polignac number, because 2121222120201 - 2² = 2121222120197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121222120211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2840385 + ... + 3508593.

It is an arithmetic number, because the mean of its divisors is an integer number (131130532715).

Almost surely, 2^{2121222120201} is an apocalyptic number.

It is an amenable number.

2121222120201 is a deficient number, since it is larger than the sum of its proper divisors (1025910664959).

2121222120201 is a wasteful number, since it uses less digits than its factorization.

2121222120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677785 (or 677782 counting only the distinct ones).

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

Adding to 2121222120201 its reverse (1020212221212), we get a palindrome (3141434341413).

The spelling of 2121222120201 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred one".