1822840921 has 6 divisors (see below), whose sum is σ = 2003618666. Its totient is φ = 1657128000.

The previous prime is 1822840909. The next prime is 1822840933. The reversal of 1822840921 is 1290482281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1822840909) and next prime (1822840933).

It can be written as a sum of positive squares in only one way, i.e., 1792590921 + 30250000 = 42339^2 + 5500^2 .

It is not a de Polignac number, because 1822840921 - 2²⁷ = 1688623193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1822840961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7532280 + ... + 7532521.

Almost surely, 2^1822840921 is an apocalyptic number.

1822840921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1822840921 is a deficient number, since it is larger than the sum of its proper divisors (180777745).

1822840921 is a wasteful number, since it uses less digits than its factorization.

1822840921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15064823 (or 15064812 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1822840921 is about 42694.7411398641. The cubic root of 1822840921 is about 1221.5640874901.

The spelling of 1822840921 in words is "one billion, eight hundred twenty-two million, eight hundred forty thousand, nine hundred twenty-one".