2045821100 has 18 divisors (see below), whose sum is σ = 4439432004. Its totient is φ = 818328400.

The previous prime is 2045821097. The next prime is 2045821103. The reversal of 2045821100 is 11285402.

It is an interprime number because it is at equal distance from previous prime (2045821097) and next prime (2045821103).

It is not an unprimeable number, because it can be changed into a prime (2045821103) 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, 10229006 + ... + 10229205.

Almost surely, 2^2045821100 is an apocalyptic number.

2045821100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2045821100 is an abundant number, since it is smaller than the sum of its proper divisors (2393610904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2045821100 is a wasteful number, since it uses less digits than its factorization.

2045821100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20458225 (or 20458218 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 2045821100 is about 45230.7539181031. The cubic root of 2045821100 is about 1269.4703187233.

The spelling of 2045821100 in words is "two billion, forty-five million, eight hundred twenty-one thousand, one hundred".