1211120020091 has 32 divisors (see below), whose sum is σ = 1309341616128. Its totient is φ = 1116165795840.

The previous prime is 1211120020079. The next prime is 1211120020147. The reversal of 1211120020091 is 1900200211121.

It is a de Polignac number, because none of the positive numbers 2^k-1211120020091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211120070091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241689776 + ... + 241694786.

It is an arithmetic number, because the mean of its divisors is an integer number (40916925504).

Almost surely, 2^{1211120020091} is an apocalyptic number.

1211120020091 is a deficient number, since it is larger than the sum of its proper divisors (98221596037).

1211120020091 is a wasteful number, since it uses less digits than its factorization.

1211120020091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6651.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1211120020091 in words is "one trillion, two hundred eleven billion, one hundred twenty million, twenty thousand, ninety-one".