2191927850868 has 384 divisors, whose sum is σ = 6524720971776. Its totient is φ = 558379008000.

The previous prime is 2191927850867. The next prime is 2191927850869. The reversal of 2191927850868 is 8680587291912.

It is an interprime number because it is at equal distance from previous prime (2191927850867) and next prime (2191927850869).

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2191927850799 and 2191927850808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191927850867) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 442721793 + ... + 442726743.

It is an arithmetic number, because the mean of its divisors is an integer number (16991460864).

Almost surely, 2^{2191927850868} is an apocalyptic number.

2191927850868 is a gapful number since it is divisible by the number (28) 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 2191927850868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3262360485888).

2191927850868 is an abundant number, since it is smaller than the sum of its proper divisors (4332793120908).

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

2191927850868 is a wasteful number, since it uses less digits than its factorization.

2191927850868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223 (or 5221 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 66.

The spelling of 2191927850868 in words is "two trillion, one hundred ninety-one billion, nine hundred twenty-seven million, eight hundred fifty thousand, eight hundred sixty-eight".