2051541421 has 2 divisors, whose sum is σ = 2051541422. Its totient is φ = 2051541420.

The previous prime is 2051541389. The next prime is 2051541509. The reversal of 2051541421 is 1241451502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1841697225 + 209844196 = 42915^2 + 14486^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051541421 - 2⁵ = 2051541389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051541721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025770710 + 1025770711.

It is an arithmetic number, because the mean of its divisors is an integer number (1025770711).

Almost surely, 2^2051541421 is an apocalyptic number.

It is an amenable number.

2051541421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051541421 is an equidigital number, since it uses as much as digits as its factorization.

2051541421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 2051541421 is about 45293.9446394328. The cubic root of 2051541421 is about 1270.6524064431.

Adding to 2051541421 its reverse (1241451502), we get a palindrome (3292992923).

The spelling of 2051541421 in words is "two billion, fifty-one million, five hundred forty-one thousand, four hundred twenty-one".