2551042121 has 4 divisors (see below), whose sum is σ = 2551936644. Its totient is φ = 2550147600.

The previous prime is 2551042073. The next prime is 2551042127. The reversal of 2551042121 is 1212401552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1025280400 + 1525761721 = 32020^2 + 39061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2551042121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551042127) 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, 442970 + ... + 448691.

It is an arithmetic number, because the mean of its divisors is an integer number (637984161).

Almost surely, 2^2551042121 is an apocalyptic number.

It is an amenable number.

2551042121 is a deficient number, since it is larger than the sum of its proper divisors (894523).

2551042121 is an equidigital number, since it uses as much as digits as its factorization.

2551042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894522.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 2551042121 is about 50507.8421732705. The cubic root of 2551042121 is about 1366.3832928702.

Adding to 2551042121 its reverse (1212401552), we get a palindrome (3763443673).

The spelling of 2551042121 in words is "two billion, five hundred fifty-one million, forty-two thousand, one hundred twenty-one".