1821366202 has 4 divisors (see below), whose sum is σ = 2732049306. Its totient is φ = 910683100.

The previous prime is 1821366191. The next prime is 1821366241. The reversal of 1821366202 is 2026631281.

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., 1639359121 + 182007081 = 40489^2 + 13491^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455341549 + ... + 455341552.

Almost surely, 2^1821366202 is an apocalyptic number.

1821366202 is a deficient number, since it is larger than the sum of its proper divisors (910683104).

1821366202 is an equidigital number, since it uses as much as digits as its factorization.

1821366202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910683103.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1821366202 is about 42677.4671460245. The cubic root of 1821366202 is about 1221.2345744069.

Adding to 1821366202 its reverse (2026631281), we get a palindrome (3847997483).

The spelling of 1821366202 in words is "one billion, eight hundred twenty-one million, three hundred sixty-six thousand, two hundred two".