2121404051 has 4 divisors (see below), whose sum is σ = 2284588992. Its totient is φ = 1958219112.

The previous prime is 2121404003. The next prime is 2121404053. The reversal of 2121404051 is 1504041212.

It is a happy number.

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 2121404051 - 2¹⁰ = 2121403027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121404053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81592451 + ... + 81592476.

It is an arithmetic number, because the mean of its divisors is an integer number (571147248).

Almost surely, 2^2121404051 is an apocalyptic number.

2121404051 is a deficient number, since it is larger than the sum of its proper divisors (163184941).

2121404051 is a wasteful number, since it uses less digits than its factorization.

2121404051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163184940.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2121404051 is about 46058.7022287863. The cubic root of 2121404051 is about 1284.9151939268.

Adding to 2121404051 its reverse (1504041212), we get a palindrome (3625445263).

The spelling of 2121404051 in words is "two billion, one hundred twenty-one million, four hundred four thousand, fifty-one".