1821212323 has 4 divisors (see below), whose sum is σ = 2081385520. Its totient is φ = 1561039128.

The previous prime is 1821212293. The next prime is 1821212357. The reversal of 1821212323 is 3232121281.

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 1821212323 - 2²¹ = 1819115171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821215323) 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, 130086588 + ... + 130086601.

It is an arithmetic number, because the mean of its divisors is an integer number (520346380).

Almost surely, 2^1821212323 is an apocalyptic number.

1821212323 is a deficient number, since it is larger than the sum of its proper divisors (260173197).

1821212323 is an equidigital number, since it uses as much as digits as its factorization.

1821212323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260173196.

The product of its digits is 1152, while the sum is 25.

The square root of 1821212323 is about 42675.6642947711. The cubic root of 1821212323 is about 1221.2001812414.

The spelling of 1821212323 in words is "one billion, eight hundred twenty-one million, two hundred twelve thousand, three hundred twenty-three".