5121234421 has 2 divisors, whose sum is σ = 5121234422. Its totient is φ = 5121234420.

The previous prime is 5121234413. The next prime is 5121234427. The reversal of 5121234421 is 1244321215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4357320100 + 763914321 = 66010^2 + 27639^2 .

It is a cyclic number.

It is not a de Polignac number, because 5121234421 - 2³ = 5121234413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5121234427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560617210 + 2560617211.

It is an arithmetic number, because the mean of its divisors is an integer number (2560617211).

Almost surely, 2^5121234421 is an apocalyptic number.

It is an amenable number.

5121234421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5121234421 is an equidigital number, since it uses as much as digits as its factorization.

5121234421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 5121234421 is about 71562.8005391069. The cubic root of 5121234421 is about 1723.6862554485.

Adding to 5121234421 its reverse (1244321215), we get a palindrome (6365555636).

The spelling of 5121234421 in words is "five billion, one hundred twenty-one million, two hundred thirty-four thousand, four hundred twenty-one".