52090421 has 2 divisors, whose sum is σ = 52090422. Its totient is φ = 52090420.

The previous prime is 52090417. The next prime is 52090453. The reversal of 52090421 is 12409025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40462321 + 11628100 = 6361^2 + 3410^2 .

It is a cyclic number.

It is not a de Polignac number, because 52090421 - 2² = 52090417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52090471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26045210 + 26045211.

It is an arithmetic number, because the mean of its divisors is an integer number (26045211).

Almost surely, 2^52090421 is an apocalyptic number.

It is an amenable number.

52090421 is a deficient number, since it is larger than the sum of its proper divisors (1).

52090421 is an equidigital number, since it uses as much as digits as its factorization.

52090421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 52090421 is about 7217.3693961166. The cubic root of 52090421 is about 373.4673348864.

Adding to 52090421 its reverse (12409025), we get a palindrome (64499446).

The spelling of 52090421 in words is "fifty-two million, ninety thousand, four hundred twenty-one".