1001212521 has 4 divisors (see below), whose sum is σ = 1334950032. Its totient is φ = 667475012.

The previous prime is 1001212519. The next prime is 1001212529. The reversal of 1001212521 is 1252121001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001212521 - 2¹ = 1001212519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001212521.

It is not an unprimeable number, because it can be changed into a prime (1001212529) 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 in 3 ways as a sum of consecutive naturals, for example, 166868751 + ... + 166868756.

It is an arithmetic number, because the mean of its divisors is an integer number (333737508).

Almost surely, 2^1001212521 is an apocalyptic number.

It is an amenable number.

1001212521 is a deficient number, since it is larger than the sum of its proper divisors (333737511).

1001212521 is an equidigital number, since it uses as much as digits as its factorization.

1001212521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333737510.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1001212521 is about 31641.9424340542. The cubic root of 1001212521 is about 1000.4040104203.

Adding to 1001212521 its reverse (1252121001), we get a palindrome (2253333522).

The spelling of 1001212521 in words is "one billion, one million, two hundred twelve thousand, five hundred twenty-one".