2181777897396 has 48 divisors (see below), whose sum is σ = 5099366343680. Its totient is φ = 726038691840.

The previous prime is 2181777897379. The next prime is 2181777897479. The reversal of 2181777897396 is 6937987771812.

It is a congruent number.

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, 17749620 + ... + 17872116.

Almost surely, 2^{2181777897396} is an apocalyptic number.

It is an amenable number.

2181777897396 is an abundant number, since it is smaller than the sum of its proper divisors (2917588446284).

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

2181777897396 is a wasteful number, since it uses less digits than its factorization.

2181777897396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124984 (or 124982 counting only the distinct ones).

The product of its digits is 448084224, while the sum is 75.

The spelling of 2181777897396 in words is "two trillion, one hundred eighty-one billion, seven hundred seventy-seven million, eight hundred ninety-seven thousand, three hundred ninety-six".