2051121425 has 12 divisors (see below), whose sum is σ = 2631094620. Its totient is φ = 1584313920.

The previous prime is 2051121419. The next prime is 2051121427. The reversal of 2051121425 is 5241211502.

It can be written as a sum of positive squares in 6 ways, for example, as 136796416 + 1914325009 = 11696^2 + 43753^2 .

It is not a de Polignac number, because 2051121425 - 2⁶ = 2051121361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2051121425.

It is not an unprimeable number, because it can be changed into a prime (2051121427) 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, 1413842 + ... + 1415291.

It is an arithmetic number, because the mean of its divisors is an integer number (219257885).

Almost surely, 2^2051121425 is an apocalyptic number.

2051121425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2051121425 is a deficient number, since it is larger than the sum of its proper divisors (579973195).

2051121425 is a wasteful number, since it uses less digits than its factorization.

2051121425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829172 (or 2829167 counting only the distinct ones).

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

The square root of 2051121425 is about 45289.3080649285. The cubic root of 2051121425 is about 1270.5656902883.

Adding to 2051121425 its reverse (5241211502), we get a palindrome (7292332927).

The spelling of 2051121425 in words is "two billion, fifty-one million, one hundred twenty-one thousand, four hundred twenty-five".