2121043451 has 4 divisors (see below), whose sum is σ = 2156993400. Its totient is φ = 2085093504.

The previous prime is 2121043433. The next prime is 2121043487. The reversal of 2121043451 is 1543401212.

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 2121043451 - 2¹⁴ = 2121027067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121043751) 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, 17974886 + ... + 17975003.

It is an arithmetic number, because the mean of its divisors is an integer number (539248350).

Almost surely, 2^2121043451 is an apocalyptic number.

2121043451 is a deficient number, since it is larger than the sum of its proper divisors (35949949).

2121043451 is an equidigital number, since it uses as much as digits as its factorization.

2121043451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35949948.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2121043451 is about 46054.7874927244. The cubic root of 2121043451 is about 1284.8423857514.

Adding to 2121043451 its reverse (1543401212), we get a palindrome (3664444663).

The spelling of 2121043451 in words is "two billion, one hundred twenty-one million, forty-three thousand, four hundred fifty-one".