11921940091820 has 48 divisors (see below), whose sum is σ = 27947245632768. Its totient is φ = 4234431149760.

The previous prime is 11921940091819. The next prime is 11921940091837. The reversal of 11921940091820 is 2819004912911.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630114224 + ... + 630133143.

It is an arithmetic number, because the mean of its divisors is an integer number (582234284016).

Almost surely, 2^{11921940091820} is an apocalyptic number.

11921940091820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11921940091820 is an abundant number, since it is smaller than the sum of its proper divisors (16025305540948).

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

11921940091820 is a wasteful number, since it uses less digits than its factorization.

11921940091820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260247430 (or 1260247428 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 47.

The spelling of 11921940091820 in words is "eleven trillion, nine hundred twenty-one billion, nine hundred forty million, ninety-one thousand, eight hundred twenty".