2181350090 has 16 divisors (see below), whose sum is σ = 3929108040. Its totient is φ = 871944960.

The previous prime is 2181350089. The next prime is 2181350099. The reversal of 2181350090 is 900531812.

It can be written as a sum of positive squares in 4 ways, for example, as 1749832561 + 431517529 = 41831^2 + 20773^2 .

It is not an unprimeable number, because it can be changed into a prime (2181350099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58835 + ... + 88454.

Almost surely, 2^2181350090 is an apocalyptic number.

2181350090 is a deficient number, since it is larger than the sum of its proper divisors (1747757950).

2181350090 is a wasteful number, since it uses less digits than its factorization.

2181350090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148777.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 2181350090 is about 46704.9257573545. The cubic root of 2181350090 is about 1296.9058742657.

The spelling of 2181350090 in words is "two billion, one hundred eighty-one million, three hundred fifty thousand, ninety".