1821997333 has 8 divisors (see below), whose sum is σ = 2007783008. Its totient is φ = 1642730544.

The previous prime is 1821997273. The next prime is 1821997339. The reversal of 1821997333 is 3337991281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1821997333 - 2¹⁷ = 1821866261 is a prime.

It is a super-2 number, since 2×1821997333² = 6639348562918225778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821997339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1629135 + ... + 1630252.

It is an arithmetic number, because the mean of its divisors is an integer number (250972876).

Almost surely, 2^1821997333 is an apocalyptic number.

1821997333 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1821997333 is a deficient number, since it is larger than the sum of its proper divisors (185785675).

1821997333 is a wasteful number, since it uses less digits than its factorization.

1821997333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259443.

The product of its digits is 244944, while the sum is 46.

The square root of 1821997333 is about 42684.8607002530. The cubic root of 1821997333 is about 1221.3756168815.

The spelling of 1821997333 in words is "one billion, eight hundred twenty-one million, nine hundred ninety-seven thousand, three hundred thirty-three".