101212010521 has 2 divisors, whose sum is σ = 101212010522. Its totient is φ = 101212010520.

The previous prime is 101212010503. The next prime is 101212010567. The reversal of 101212010521 is 125010212101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95852160000 + 5359850521 = 309600^2 + 73211^2 .

It is a cyclic number.

It is not a de Polignac number, because 101212010521 - 2²¹ = 101209913369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101212010495 and 101212010504.

It is not a weakly prime, because it can be changed into another prime (101212019521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50606005260 + 50606005261.

It is an arithmetic number, because the mean of its divisors is an integer number (50606005261).

Almost surely, 2^101212010521 is an apocalyptic number.

It is an amenable number.

101212010521 is a deficient number, since it is larger than the sum of its proper divisors (1).

101212010521 is an equidigital number, since it uses as much as digits as its factorization.

101212010521 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 16.

Adding to 101212010521 its reverse (125010212101), we get a palindrome (226222222622).

The spelling of 101212010521 in words is "one hundred one billion, two hundred twelve million, ten thousand, five hundred twenty-one".