521212001 has 2 divisors, whose sum is σ = 521212002. Its totient is φ = 521212000.

The previous prime is 521211997. The next prime is 521212019. The reversal of 521212001 is 100212125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460059601 + 61152400 = 21449^2 + 7820^2 .

It is a cyclic number.

It is not a de Polignac number, because 521212001 - 2² = 521211997 is a prime.

It is not a weakly prime, because it can be changed into another prime (521212091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260606000 + 260606001.

It is an arithmetic number, because the mean of its divisors is an integer number (260606001).

Almost surely, 2^521212001 is an apocalyptic number.

It is an amenable number.

521212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

521212001 is an equidigital number, since it uses as much as digits as its factorization.

521212001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 521212001 is about 22830.0679149231. The cubic root of 521212001 is about 804.7694263960.

Adding to 521212001 its reverse (100212125), we get a palindrome (621424126).

The spelling of 521212001 in words is "five hundred twenty-one million, two hundred twelve thousand, one".