1211222002121 has 4 divisors (see below), whose sum is σ = 1211376838272. Its totient is φ = 1211067165972.

The previous prime is 1211222002099. The next prime is 1211222002153. The reversal of 1211222002121 is 1212002221121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211222002121 - 2¹⁴ = 1211221985737 is a prime.

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 1211222002121.

It is not an unprimeable number, because it can be changed into a prime (1211222002181) 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, 77406341 + ... + 77421986.

It is an arithmetic number, because the mean of its divisors is an integer number (302844209568).

Almost surely, 2^{1211222002121} is an apocalyptic number.

It is an amenable number.

1211222002121 is a deficient number, since it is larger than the sum of its proper divisors (154836151).

1211222002121 is an equidigital number, since it uses as much as digits as its factorization.

1211222002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154836150.

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

Adding to 1211222002121 its reverse (1212002221121), we get a palindrome (2423224223242).

The spelling of 1211222002121 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two thousand, one hundred twenty-one".