2181683390 has 16 divisors (see below), whose sum is σ = 4022812080. Its totient is φ = 851388480.

The previous prime is 2181683381. The next prime is 2181683393. The reversal of 2181683390 is 933861812.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181683393) 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, 2660180 + ... + 2660999.

It is an arithmetic number, because the mean of its divisors is an integer number (251425755).

Almost surely, 2^2181683390 is an apocalyptic number.

2181683390 is a deficient number, since it is larger than the sum of its proper divisors (1841128690).

2181683390 is a wasteful number, since it uses less digits than its factorization.

2181683390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5321227.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 2181683390 is about 46708.4937671940. The cubic root of 2181683390 is about 1296.9719246009.

The spelling of 2181683390 in words is "two billion, one hundred eighty-one million, six hundred eighty-three thousand, three hundred ninety".