20191921919202 has 96 divisors (see below), whose sum is σ = 45150875622720. Its totient is φ = 6014595312000.

The previous prime is 20191921919189. The next prime is 20191921919207. The reversal of 20191921919202 is 20291912919102.

It is not an unprimeable number, because it can be changed into a prime (20191921919207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9201768 + ... + 11182860.

It is an arithmetic number, because the mean of its divisors is an integer number (470321621070).

Almost surely, 2^{20191921919202} is an apocalyptic number.

20191921919202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20191921919202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22575437811360).

20191921919202 is an abundant number, since it is smaller than the sum of its proper divisors (24958953703518).

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

20191921919202 is a wasteful number, since it uses less digits than its factorization.

20191921919202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981360 (or 1981349 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 48.

The spelling of 20191921919202 in words is "twenty trillion, one hundred ninety-one billion, nine hundred twenty-one million, nine hundred nineteen thousand, two hundred two".