2181425942 has 4 divisors (see below), whose sum is σ = 3272138916. Its totient is φ = 1090712970.

The previous prime is 2181425933. The next prime is 2181425957. The reversal of 2181425942 is 2495241812.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 2181425896 and 2181425905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545356484 + ... + 545356487.

It is an arithmetic number, because the mean of its divisors is an integer number (818034729).

Almost surely, 2^2181425942 is an apocalyptic number.

2181425942 is a deficient number, since it is larger than the sum of its proper divisors (1090712974).

2181425942 is a wasteful number, since it uses less digits than its factorization.

2181425942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090712973.

The product of its digits is 46080, while the sum is 38.

The square root of 2181425942 is about 46705.7377845592. The cubic root of 2181425942 is about 1296.9209065103.

The spelling of 2181425942 in words is "two billion, one hundred eighty-one million, four hundred twenty-five thousand, nine hundred forty-two".