52129421 has 2 divisors, whose sum is σ = 52129422. Its totient is φ = 52129420.

The previous prime is 52129387. The next prime is 52129423. The reversal of 52129421 is 12492125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31753225 + 20376196 = 5635^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 52129421 - 2¹⁰ = 52128397 is a prime.

Together with 52129423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52129423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26064710 + 26064711.

It is an arithmetic number, because the mean of its divisors is an integer number (26064711).

Almost surely, 2^52129421 is an apocalyptic number.

It is an amenable number.

52129421 is a deficient number, since it is larger than the sum of its proper divisors (1).

52129421 is an equidigital number, since it uses as much as digits as its factorization.

52129421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 52129421 is about 7220.0707060250. The cubic root of 52129421 is about 373.5605163985.

The spelling of 52129421 in words is "fifty-two million, one hundred twenty-nine thousand, four hundred twenty-one".