1821092121 has 48 divisors (see below), whose sum is σ = 2751840000. Its totient is φ = 1159591680.

The previous prime is 1821092099. The next prime is 1821092167. The reversal of 1821092121 is 1212901281.

It is not a de Polignac number, because 1821092121 - 2⁶ = 1821092057 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1821091121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5217855 + ... + 5218203.

It is an arithmetic number, because the mean of its divisors is an integer number (57330000).

Almost surely, 2^1821092121 is an apocalyptic number.

It is an amenable number.

1821092121 is a deficient number, since it is larger than the sum of its proper divisors (930747879).

1821092121 is a wasteful number, since it uses less digits than its factorization.

1821092121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1821092121 is about 42674.2559513344. The cubic root of 1821092121 is about 1221.1733138023.

The spelling of 1821092121 in words is "one billion, eight hundred twenty-one million, ninety-two thousand, one hundred twenty-one".