1011213209991 has 16 divisors (see below), whose sum is σ = 1372732963200. Its totient is φ = 661944405408.

The previous prime is 1011213209987. The next prime is 1011213209999. The reversal of 1011213209991 is 1999023121101.

It is not a de Polignac number, because 1011213209991 - 2² = 1011213209987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011213209999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3173376 + ... + 3477461.

It is an arithmetic number, because the mean of its divisors is an integer number (85795810200).

Almost surely, 2^{1011213209991} is an apocalyptic number.

1011213209991 is a deficient number, since it is larger than the sum of its proper divisors (361519753209).

1011213209991 is an equidigital number, since it uses as much as digits as its factorization.

1011213209991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6651758.

The product of its (nonzero) digits is 8748, while the sum is 39.

The spelling of 1011213209991 in words is "one trillion, eleven billion, two hundred thirteen million, two hundred nine thousand, nine hundred ninety-one".