1821274219 has 4 divisors (see below), whose sum is σ = 1821616096. Its totient is φ = 1820932344.

The previous prime is 1821274187. The next prime is 1821274249. The reversal of 1821274219 is 9124721281.

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

It is a cyclic number.

It is not a de Polignac number, because 1821274219 - 2⁵ = 1821274187 is a prime.

It is a super-2 number, since 2×1821274219² = 6634079561588119922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821274249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162819 + ... + 173644.

It is an arithmetic number, because the mean of its divisors is an integer number (455404024).

Almost surely, 2^1821274219 is an apocalyptic number.

1821274219 is a deficient number, since it is larger than the sum of its proper divisors (341877).

1821274219 is an equidigital number, since it uses as much as digits as its factorization.

1821274219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341876.

The product of its digits is 16128, while the sum is 37.

The square root of 1821274219 is about 42676.3894794300. The cubic root of 1821274219 is about 1221.2140157166.

The spelling of 1821274219 in words is "one billion, eight hundred twenty-one million, two hundred seventy-four thousand, two hundred nineteen".