1211202122121 has 12 divisors (see below), whose sum is σ = 1751031549748. Its totient is φ = 806767755264.

The previous prime is 1211202122069. The next prime is 1211202122183. The reversal of 1211202122121 is 1212212021121.

1211202122121 is a `hidden beast` number, since 121 + 120 + 212 + 212 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1002129132096 + 209072990025 = 1001064^2 + 457245^2 .

It is not a de Polignac number, because 1211202122121 - 2¹⁹ = 1211201597833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211202122094 and 1211202122103.

It is not an unprimeable number, because it can be changed into a prime (1211202122621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58349560 + ... + 58370313.

Almost surely, 2^{1211202122121} is an apocalyptic number.

It is an amenable number.

1211202122121 is a deficient number, since it is larger than the sum of its proper divisors (539829427627).

1211202122121 is a wasteful number, since it uses less digits than its factorization.

1211202122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116721032 (or 116721029 counting only the distinct ones).

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

Adding to 1211202122121 its reverse (1212212021121), we get a palindrome (2423414143242).

The spelling of 1211202122121 in words is "one trillion, two hundred eleven billion, two hundred two million, one hundred twenty-two thousand, one hundred twenty-one".