1211121228 has 24 divisors (see below), whose sum is σ = 2830058560. Its totient is φ = 403120080.

The previous prime is 1211121227. The next prime is 1211121253. The reversal of 1211121228 is 8221211121.

It is not an unprimeable number, because it can be changed into a prime (1211121227) 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, 64738 + ... + 81321.

Almost surely, 2^1211121228 is an apocalyptic number.

It is an amenable number.

1211121228 is an abundant number, since it is smaller than the sum of its proper divisors (1618937332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211121228 is a wasteful number, since it uses less digits than its factorization.

1211121228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146757 (or 146755 counting only the distinct ones).

The product of its digits is 128, while the sum is 21.

The square root of 1211121228 is about 34801.1670493965. The cubic root of 1211121228 is about 1065.9312764945.

Adding to 1211121228 its reverse (8221211121), we get a palindrome (9432332349).

The spelling of 1211121228 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty-eight".