1211121012 has 24 divisors (see below), whose sum is σ = 2832673312. Its totient is φ = 402746400.

The previous prime is 1211120993. The next prime is 1211121013. The reversal of 1211121012 is 2101211121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114814 + ... + 124917.

Almost surely, 2^1211121012 is an apocalyptic number.

1211121012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211121012 is an abundant number, since it is smaller than the sum of its proper divisors (1621552300).

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

1211121012 is a wasteful number, since it uses less digits than its factorization.

1211121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240159 (or 240157 counting only the distinct ones).

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

The square root of 1211121012 is about 34801.1639460521. The cubic root of 1211121012 is about 1065.9312131259.

Adding to 1211121012 its reverse (2101211121), we get a palindrome (3312332133).

The spelling of 1211121012 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, twelve".