2147821369 has 4 divisors (see below), whose sum is σ = 2193519744. Its totient is φ = 2102122996.

The previous prime is 2147821339. The next prime is 2147821393. The reversal of 2147821369 is 9631287412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2147821369 - 2⁷ = 2147821241 is a prime.

It is a super-2 number, since 2×2147821369² = 9226273266266068322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2147821339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22849117 + ... + 22849210.

It is an arithmetic number, because the mean of its divisors is an integer number (548379936).

Almost surely, 2^2147821369 is an apocalyptic number.

It is an amenable number.

2147821369 is a deficient number, since it is larger than the sum of its proper divisors (45698375).

2147821369 is an equidigital number, since it uses as much as digits as its factorization.

2147821369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45698374.

The product of its digits is 145152, while the sum is 43.

The square root of 2147821369 is about 46344.5937408022. The cubic root of 2147821369 is about 1290.2267832365.

The spelling of 2147821369 in words is "two billion, one hundred forty-seven million, eight hundred twenty-one thousand, three hundred sixty-nine".