1211121200121 has 32 divisors (see below), whose sum is σ = 1943396812800. Its totient is φ = 655392695040.

The previous prime is 1211121200117. The next prime is 1211121200173. The reversal of 1211121200121 is 1210021211121.

It is a happy number.

It is not a de Polignac number, because 1211121200121 - 2² = 1211121200117 is a prime.

It is a super-2 number, since 2×1211121200121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211121200121.

It is not an unprimeable number, because it can be changed into a prime (1211121000121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 459276 + ... + 1622706.

It is an arithmetic number, because the mean of its divisors is an integer number (60731150400).

Almost surely, 2^{1211121200121} is an apocalyptic number.

It is an amenable number.

1211121200121 is a deficient number, since it is larger than the sum of its proper divisors (732275612679).

1211121200121 is a wasteful number, since it uses less digits than its factorization.

1211121200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166069.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211121200121 its reverse (1210021211121), we get a palindrome (2421142411242).

The spelling of 1211121200121 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred thousand, one hundred twenty-one".