505212161521 has 2 divisors, whose sum is σ = 505212161522. Its totient is φ = 505212161520.

The previous prime is 505212161483. The next prime is 505212161533. The reversal of 505212161521 is 125161212505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370772605921 + 134439555600 = 608911^2 + 366660^2 .

It is a cyclic number.

It is not a de Polignac number, because 505212161521 - 2⁷ = 505212161393 is a prime.

It is not a weakly prime, because it can be changed into another prime (505212161561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252606080760 + 252606080761.

It is an arithmetic number, because the mean of its divisors is an integer number (252606080761).

Almost surely, 2^505212161521 is an apocalyptic number.

It is an amenable number.

505212161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

505212161521 is an equidigital number, since it uses as much as digits as its factorization.

505212161521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 31.

The spelling of 505212161521 in words is "five hundred five billion, two hundred twelve million, one hundred sixty-one thousand, five hundred twenty-one".