1210211221121 has 16 divisors (see below), whose sum is σ = 1403051310720. Its totient is φ = 1022432864640.

The previous prime is 1210211221067. The next prime is 1210211221127. The reversal of 1210211221121 is 1211221120121.

It is a cyclic number.

It is not a de Polignac number, because 1210211221121 - 2²² = 1210207026817 is a prime.

It is a super-2 number, since 2×1210211221121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210211221121.

It is not an unprimeable number, because it can be changed into a prime (1210211221127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2866475 + ... + 3261456.

It is an arithmetic number, because the mean of its divisors is an integer number (87690706920).

Almost surely, 2^{1210211221121} is an apocalyptic number.

It is an amenable number.

1210211221121 is a deficient number, since it is larger than the sum of its proper divisors (192840089599).

1210211221121 is an equidigital number, since it uses as much as digits as its factorization.

1210211221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6128344.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1210211221121 its reverse (1211221120121), we get a palindrome (2421432341242).

The spelling of 1210211221121 in words is "one trillion, two hundred ten billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".