50513217421 has 2 divisors, whose sum is σ = 50513217422. Its totient is φ = 50513217420.

The previous prime is 50513217401. The next prime is 50513217439. The reversal of 50513217421 is 12471231505.

50513217421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28971784521 + 21541432900 = 170211^2 + 146770^2 .

It is a cyclic number.

It is not a de Polignac number, because 50513217421 - 2⁹ = 50513216909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50513217401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25256608710 + 25256608711.

It is an arithmetic number, because the mean of its divisors is an integer number (25256608711).

Almost surely, 2^50513217421 is an apocalyptic number.

It is an amenable number.

50513217421 is a deficient number, since it is larger than the sum of its proper divisors (1).

50513217421 is an equidigital number, since it uses as much as digits as its factorization.

50513217421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

Adding to 50513217421 its reverse (12471231505), we get a palindrome (62984448926).

The spelling of 50513217421 in words is "fifty billion, five hundred thirteen million, two hundred seventeen thousand, four hundred twenty-one".