2121451013 has 12 divisors (see below), whose sum is σ = 2355895500. Its totient is φ = 1908698880.

The previous prime is 2121451009. The next prime is 2121451019. The reversal of 2121451013 is 3101541212.

It can be written as a sum of positive squares in 2 ways, for example, as 704530849 + 1416920164 = 26543^2 + 37642^2 .

It is not a de Polignac number, because 2121451013 - 2² = 2121451009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121451019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78638 + ... + 102111.

It is an arithmetic number, because the mean of its divisors is an integer number (196324625).

Almost surely, 2^2121451013 is an apocalyptic number.

It is an amenable number.

2121451013 is a deficient number, since it is larger than the sum of its proper divisors (234444487).

2121451013 is a wasteful number, since it uses less digits than its factorization.

2121451013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180868 (or 180857 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2121451013 is about 46059.2120319052. The cubic root of 2121451013 is about 1284.9246753426.

Adding to 2121451013 its reverse (3101541212), we get a palindrome (5222992225).

It can be divided in two parts, 21214 and 51013, that added together give a palindrome (72227).

The spelling of 2121451013 in words is "two billion, one hundred twenty-one million, four hundred fifty-one thousand, thirteen".