1210212022121 has 4 divisors (see below), whose sum is σ = 1223809910100. Its totient is φ = 1196614134144.

The previous prime is 1210212022093. The next prime is 1210212022169. The reversal of 1210212022121 is 1212202120121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 375108476521 + 835103545600 = 612461^2 + 913840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210212022121 is a prime.

It is a super-2 number, since 2×1210212022121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210212022121.

It is not an unprimeable number, because it can be changed into a prime (1210212028121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6798943856 + ... + 6798944033.

It is an arithmetic number, because the mean of its divisors is an integer number (305952477525).

Almost surely, 2^{1210212022121} is an apocalyptic number.

It is an amenable number.

1210212022121 is a deficient number, since it is larger than the sum of its proper divisors (13597887979).

1210212022121 is an equidigital number, since it uses as much as digits as its factorization.

1210212022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13597887978.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1210212022121 its reverse (1212202120121), we get a palindrome (2422414142242).

The spelling of 1210212022121 in words is "one trillion, two hundred ten billion, two hundred twelve million, twenty-two thousand, one hundred twenty-one".