1211101202121 has 8 divisors (see below), whose sum is σ = 1642171121760. Its totient is φ = 793716041952.

The previous prime is 1211101202119. The next prime is 1211101202137. The reversal of 1211101202121 is 1212021011121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211101202121 - 2¹ = 1211101202119 is a prime.

It is a super-2 number, since 2×1211101202121² (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 1211101202121.

It is not an unprimeable number, because it can be changed into a prime (1211101202321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3421189660 + ... + 3421190013.

It is an arithmetic number, because the mean of its divisors is an integer number (205271390220).

Almost surely, 2^{1211101202121} is an apocalyptic number.

It is an amenable number.

1211101202121 is a deficient number, since it is larger than the sum of its proper divisors (431069919639).

1211101202121 is an equidigital number, since it uses as much as digits as its factorization.

1211101202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6842379735.

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

Adding to 1211101202121 its reverse (1212021011121), we get a palindrome (2423122213242).

It can be divided in two parts, 121110 and 1202121, that added together give a palindrome (1323231).

The spelling of 1211101202121 in words is "one trillion, two hundred eleven billion, one hundred one million, two hundred two thousand, one hundred twenty-one".