2181900004 has 12 divisors (see below), whose sum is σ = 3883042800. Its totient is φ = 1072459208.

The previous prime is 2181899989. The next prime is 2181900013. The reversal of 2181900004 is 4000091812.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4622434 + ... + 4622905.

It is an arithmetic number, because the mean of its divisors is an integer number (323586900).

Almost surely, 2^2181900004 is an apocalyptic number.

It is an amenable number.

2181900004 is a deficient number, since it is larger than the sum of its proper divisors (1701142796).

2181900004 is a wasteful number, since it uses less digits than its factorization.

2181900004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9245402 (or 9245400 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 2181900004 is about 46710.8124956096. The cubic root of 2181900004 is about 1297.0148475689.

Adding to 2181900004 its reverse (4000091812), we get a palindrome (6181991816).

The spelling of 2181900004 in words is "two billion, one hundred eighty-one million, nine hundred thousand, four".