1211122009990 has 16 divisors (see below), whose sum is σ = 2180736548640. Its totient is φ = 484289486080.

The previous prime is 1211122009957. The next prime is 1211122009991. The reversal of 1211122009990 is 999002211121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211122009991) 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, 19882810 + ... + 19943629.

It is an arithmetic number, because the mean of its divisors is an integer number (136296034290).

Almost surely, 2^{1211122009990} is an apocalyptic number.

1211122009990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211122009990 is a deficient number, since it is larger than the sum of its proper divisors (969614538650).

1211122009990 is a wasteful number, since it uses less digits than its factorization.

1211122009990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39829487.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 1211122009990 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, nine thousand, nine hundred ninety".