2102243240 has 32 divisors (see below), whose sum is σ = 4935703680. Its totient is φ = 804336192.

The previous prime is 2102243233. The next prime is 2102243243. The reversal of 2102243240 is 423422012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (2102243243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1141604 + ... + 1143443.

It is an arithmetic number, because the mean of its divisors is an integer number (154240740).

Almost surely, 2^2102243240 is an apocalyptic number.

2102243240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102243240 is an abundant number, since it is smaller than the sum of its proper divisors (2833460440).

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

2102243240 is a wasteful number, since it uses less digits than its factorization.

2102243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285081 (or 2285077 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2102243240 is about 45850.2261717431. The cubic root of 2102243240 is about 1281.0349783446.

Adding to 2102243240 its reverse (423422012), we get a palindrome (2525665252).

The spelling of 2102243240 in words is "two billion, one hundred two million, two hundred forty-three thousand, two hundred forty".