2157428865800 has 48 divisors (see below), whose sum is σ = 5401869974340. Its totient is φ = 796589118720.

The previous prime is 2157428865773. The next prime is 2157428865827. The reversal of 2157428865800 is 85688247512.

It is an interprime number because it is at equal distance from previous prime (2157428865773) and next prime (2157428865827).

It can be written as a sum of positive squares in 6 ways, for example, as 395135445604 + 1762293420196 = 628598^2 + 1327514^2 .

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, 414887567 + ... + 414892766.

Almost surely, 2^{2157428865800} is an apocalyptic number.

2157428865800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157428865800 is an abundant number, since it is smaller than the sum of its proper divisors (3244441108540).

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

2157428865800 is a wasteful number, since it uses less digits than its factorization.

2157428865800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829780362 (or 829780353 counting only the distinct ones).

The product of its (nonzero) digits is 8601600, while the sum is 56.

The spelling of 2157428865800 in words is "two trillion, one hundred fifty-seven billion, four hundred twenty-eight million, eight hundred sixty-five thousand, eight hundred".