1211120121 has 16 divisors (see below), whose sum is σ = 1669910528. Its totient is φ = 779965200.

The previous prime is 1211120093. The next prime is 1211120123. The reversal of 1211120121 is 1210211121.

It is not a de Polignac number, because 1211120121 - 2¹³ = 1211111929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211120097 and 1211120106.

It is not an unprimeable number, because it can be changed into a prime (1211120123) 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, 41700 + ... + 64506.

It is an arithmetic number, because the mean of its divisors is an integer number (104369408).

Almost surely, 2^1211120121 is an apocalyptic number.

It is an amenable number.

1211120121 is a deficient number, since it is larger than the sum of its proper divisors (458790407).

1211120121 is a wasteful number, since it uses less digits than its factorization.

1211120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23412.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1211120121 is about 34801.1511447538. The cubic root of 1211120121 is about 1065.9309517303.

Adding to 1211120121 its reverse (1210211121), we get a palindrome (2421331242).

The spelling of 1211120121 in words is "one billion, two hundred eleven million, one hundred twenty thousand, one hundred twenty-one".