2181394530 has 64 divisors (see below), whose sum is σ = 6648065280. Its totient is φ = 498604032.

The previous prime is 2181394517. The next prime is 2181394561. The reversal of 2181394530 is 354931812.

2181394530 is a `hidden beast` number, since 21 + 8 + 13 + 94 + 530 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 575199 + ... + 578978.

It is an arithmetic number, because the mean of its divisors is an integer number (103876020).

Almost surely, 2^2181394530 is an apocalyptic number.

2181394530 is an abundant number, since it is smaller than the sum of its proper divisors (4466670750).

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

2181394530 is a wasteful number, since it uses less digits than its factorization.

2181394530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154200 (or 1154194 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 2181394530 is about 46705.4015077485. The cubic root of 2181394530 is about 1296.9146813658.

The spelling of 2181394530 in words is "two billion, one hundred eighty-one million, three hundred ninety-four thousand, five hundred thirty".