2045221340 has 24 divisors (see below), whose sum is σ = 4295979072. Its totient is φ = 817895360.

The previous prime is 2045221337. The next prime is 2045221349. The reversal of 2045221340 is 431225402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045221349) 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, 100205 + ... + 118875.

It is an arithmetic number, because the mean of its divisors is an integer number (178999128).

Almost surely, 2^2045221340 is an apocalyptic number.

2045221340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2045221340 is an abundant number, since it is smaller than the sum of its proper divisors (2250757732).

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

2045221340 is a wasteful number, since it uses less digits than its factorization.

2045221340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24157 (or 24155 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2045221340 is about 45224.1234298687. The cubic root of 2045221340 is about 1269.3462524933.

Adding to 2045221340 its reverse (431225402), we get a palindrome (2476446742).

The spelling of 2045221340 in words is "two billion, forty-five million, two hundred twenty-one thousand, three hundred forty".