2121144451 has 16 divisors (see below), whose sum is σ = 2306672640. Its totient is φ = 1942848640.

The previous prime is 2121144449. The next prime is 2121144499. The reversal of 2121144451 is 1544411212.

It is a cyclic number.

It is not a de Polignac number, because 2121144451 - 2¹ = 2121144449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121144551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135606 + ... + 150436.

It is an arithmetic number, because the mean of its divisors is an integer number (144167040).

Almost surely, 2^2121144451 is an apocalyptic number.

2121144451 is a deficient number, since it is larger than the sum of its proper divisors (185528189).

2121144451 is a wasteful number, since it uses less digits than its factorization.

2121144451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15074.

The product of its digits is 1280, while the sum is 25.

The square root of 2121144451 is about 46055.8839997671. The cubic root of 2121144451 is about 1284.8627793335.

Adding to 2121144451 its reverse (1544411212), we get a palindrome (3665555663).

The spelling of 2121144451 in words is "two billion, one hundred twenty-one million, one hundred forty-four thousand, four hundred fifty-one".