52139373421 has 2 divisors, whose sum is σ = 52139373422. Its totient is φ = 52139373420.

The previous prime is 52139373413. The next prime is 52139373449. The reversal of 52139373421 is 12437393125.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28363275396 + 23776098025 = 168414^2 + 154195^2 .

It is a cyclic number.

It is not a de Polignac number, because 52139373421 - 2³ = 52139373413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52139373721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26069686710 + 26069686711.

It is an arithmetic number, because the mean of its divisors is an integer number (26069686711).

Almost surely, 2^52139373421 is an apocalyptic number.

It is an amenable number.

52139373421 is a deficient number, since it is larger than the sum of its proper divisors (1).

52139373421 is an equidigital number, since it uses as much as digits as its factorization.

52139373421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The spelling of 52139373421 in words is "fifty-two billion, one hundred thirty-nine million, three hundred seventy-three thousand, four hundred twenty-one".