2171378488986 has 48 divisors (see below), whose sum is σ = 5613087257280. Its totient is φ = 620393853240.

The previous prime is 2171378488831. The next prime is 2171378489041. The reversal of 2171378488986 is 6898848731712.

2171378488986 is a `hidden beast` number, since 2 + 1 + 7 + 137 + 8 + 488 + 9 + 8 + 6 = 666.

It is a super-2 number, since 2×2171378488986² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 410310750 + ... + 410316041.

It is an arithmetic number, because the mean of its divisors is an integer number (116939317860).

Almost surely, 2^{2171378488986} is an apocalyptic number.

2171378488986 is an abundant number, since it is smaller than the sum of its proper divisors (3441708768294).

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

2171378488986 is a wasteful number, since it uses less digits than its factorization.

2171378488986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820626816 (or 820626803 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 72.

The spelling of 2171378488986 in words is "two trillion, one hundred seventy-one billion, three hundred seventy-eight million, four hundred eighty-eight thousand, nine hundred eighty-six".