2121443747 has 4 divisors (see below), whose sum is σ = 2166580896. Its totient is φ = 2076306600.

The previous prime is 2121443741. The next prime is 2121443759. The reversal of 2121443747 is 7473441212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121443747 - 2¹² = 2121439651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121443741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22568504 + ... + 22568597.

It is an arithmetic number, because the mean of its divisors is an integer number (541645224).

Almost surely, 2^2121443747 is an apocalyptic number.

2121443747 is a deficient number, since it is larger than the sum of its proper divisors (45137149).

2121443747 is an equidigital number, since it uses as much as digits as its factorization.

2121443747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45137148.

The product of its digits is 37632, while the sum is 35.

The square root of 2121443747 is about 46059.1331551083. The cubic root of 2121443747 is about 1284.9232083792.

Adding to 2121443747 its reverse (7473441212), we get a palindrome (9594884959).

The spelling of 2121443747 in words is "two billion, one hundred twenty-one million, four hundred forty-three thousand, seven hundred forty-seven".