521025541121 has 2 divisors, whose sum is σ = 521025541122. Its totient is φ = 521025541120.

The previous prime is 521025541103. The next prime is 521025541129. The reversal of 521025541121 is 121145520125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520474230721 + 551310400 = 721439^2 + 23480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521025541121 is a prime.

It is a super-2 number, since 2×521025541121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521025541129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260512770560 + 260512770561.

It is an arithmetic number, because the mean of its divisors is an integer number (260512770561).

Almost surely, 2^521025541121 is an apocalyptic number.

It is an amenable number.

521025541121 is a deficient number, since it is larger than the sum of its proper divisors (1).

521025541121 is an equidigital number, since it uses as much as digits as its factorization.

521025541121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 29.

The spelling of 521025541121 in words is "five hundred twenty-one billion, twenty-five million, five hundred forty-one thousand, one hundred twenty-one".