2181941628 has 24 divisors (see below), whose sum is σ = 5110562688. Its totient is φ = 724547376.

The previous prime is 2181941623. The next prime is 2181941659. The reversal of 2181941628 is 8261491812.

It is a self number, because there is not a number n which added to its sum of digits gives 2181941628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181941623) 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, 342526 + ... + 348837.

It is an arithmetic number, because the mean of its divisors is an integer number (212940112).

Almost surely, 2^2181941628 is an apocalyptic number.

It is an amenable number.

2181941628 is an abundant number, since it is smaller than the sum of its proper divisors (2928621060).

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

2181941628 is a wasteful number, since it uses less digits than its factorization.

2181941628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691633 (or 691631 counting only the distinct ones).

The product of its digits is 55296, while the sum is 42.

The square root of 2181941628 is about 46711.2580434310. The cubic root of 2181941628 is about 1297.0230952128.

The spelling of 2181941628 in words is "two billion, one hundred eighty-one million, nine hundred forty-one thousand, six hundred twenty-eight".