2121243242 has 4 divisors (see below), whose sum is σ = 3181864866. Its totient is φ = 1060621620.

The previous prime is 2121243233. The next prime is 2121243247. The reversal of 2121243242 is 2423421212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1600080001 + 521163241 = 40001^2 + 22829^2 .

It is not an unprimeable number, because it can be changed into a prime (2121243247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530310809 + ... + 530310812.

Almost surely, 2^2121243242 is an apocalyptic number.

2121243242 is a deficient number, since it is larger than the sum of its proper divisors (1060621624).

2121243242 is a wasteful number, since it uses less digits than its factorization.

2121243242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060621623.

The product of its digits is 1536, while the sum is 23.

The square root of 2121243242 is about 46056.9564995344. The cubic root of 2121243242 is about 1284.8827262554.

Adding to 2121243242 its reverse (2423421212), we get a palindrome (4544664454).

The spelling of 2121243242 in words is "two billion, one hundred twenty-one million, two hundred forty-three thousand, two hundred forty-two".