1091911203020 has 96 divisors (see below), whose sum is σ = 2523243211776. Its totient is φ = 393613344000.

The previous prime is 1091911203017. The next prime is 1091911203101. The reversal of 1091911203020 is 203021191901.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16144394 + ... + 16211886.

It is an arithmetic number, because the mean of its divisors is an integer number (26283783456).

Almost surely, 2^{1091911203020} is an apocalyptic number.

1091911203020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091911203020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1261621605888).

1091911203020 is an abundant number, since it is smaller than the sum of its proper divisors (1431332008756).

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

1091911203020 is a wasteful number, since it uses less digits than its factorization.

1091911203020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68151 (or 68149 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 29.

Adding to 1091911203020 its reverse (203021191901), we get a palindrome (1294932394921).

The spelling of 1091911203020 in words is "one trillion, ninety-one billion, nine hundred eleven million, two hundred three thousand, twenty".