1211022220121 has 8 divisors (see below), whose sum is σ = 1384115000640. Its totient is φ = 1037951841168.

The previous prime is 1211022220087. The next prime is 1211022220127. The reversal of 1211022220121 is 1210222201121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211022220121 - 2¹⁰ = 1211022219097 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 1211022220121.

It is not an unprimeable number, because it can be changed into a prime (1211022220127) 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, 5484386 + ... + 5700923.

It is an arithmetic number, because the mean of its divisors is an integer number (173014375080).

Almost surely, 2^{1211022220121} is an apocalyptic number.

It is an amenable number.

1211022220121 is a deficient number, since it is larger than the sum of its proper divisors (173092780519).

1211022220121 is a wasteful number, since it uses less digits than its factorization.

1211022220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11200783.

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

Adding to 1211022220121 its reverse (1210222201121), we get a palindrome (2421244421242).

The spelling of 1211022220121 in words is "one trillion, two hundred eleven billion, twenty-two million, two hundred twenty thousand, one hundred twenty-one".