1821032242 has 4 divisors (see below), whose sum is σ = 2731548366. Its totient is φ = 910516120.

The previous prime is 1821032233. The next prime is 1821032243. The reversal of 1821032242 is 2422301281.

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

It can be written as a sum of positive squares in only one way, i.e., 1772325801 + 48706441 = 42099^2 + 6979^2 .

It is not an unprimeable number, because it can be changed into a prime (1821032243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455258059 + ... + 455258062.

Almost surely, 2^1821032242 is an apocalyptic number.

1821032242 is a deficient number, since it is larger than the sum of its proper divisors (910516124).

1821032242 is an equidigital number, since it uses as much as digits as its factorization.

1821032242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910516123.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1821032242 is about 42673.5543633291. The cubic root of 1821032242 is about 1221.1599292627.

The spelling of 1821032242 in words is "one billion, eight hundred twenty-one million, thirty-two thousand, two hundred forty-two".