2145240042 has 16 divisors (see below), whose sum is σ = 4680523872. Its totient is φ = 650072720.

The previous prime is 2145240017. The next prime is 2145240043. The reversal of 2145240042 is 2400425412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2145239994 and 2145240021.

It is not an unprimeable number, because it can be changed into a prime (2145240043) 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, 16251753 + ... + 16251884.

It is an arithmetic number, because the mean of its divisors is an integer number (292532742).

Almost surely, 2^2145240042 is an apocalyptic number.

2145240042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2145240042 is an abundant number, since it is smaller than the sum of its proper divisors (2535283830).

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

2145240042 is a wasteful number, since it uses less digits than its factorization.

2145240042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32503653.

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 2145240042 is about 46316.7360896685. The cubic root of 2145240042 is about 1289.7096961070.

Adding to 2145240042 its reverse (2400425412), we get a palindrome (4545665454).

The spelling of 2145240042 in words is "two billion, one hundred forty-five million, two hundred forty thousand, forty-two".