2171997257948 has 36 divisors (see below), whose sum is σ = 4421659634280. Its totient is φ = 930836223072.

The previous prime is 2171997257921. The next prime is 2171997258037. The reversal of 2171997257948 is 8497527991712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12707438 + ... + 12877226.

It is an arithmetic number, because the mean of its divisors is an integer number (122823878730).

Almost surely, 2^{2171997257948} is an apocalyptic number.

2171997257948 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2171997257948 is an abundant number, since it is smaller than the sum of its proper divisors (2249662376332).

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

2171997257948 is a wasteful number, since it uses less digits than its factorization.

2171997257948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235074 (or 235065 counting only the distinct ones).

The product of its digits is 160030080, while the sum is 71.

The spelling of 2171997257948 in words is "two trillion, one hundred seventy-one billion, nine hundred ninety-seven million, two hundred fifty-seven thousand, nine hundred forty-eight".