1012152221 has 4 divisors (see below), whose sum is σ = 1012241244. Its totient is φ = 1012063200.

The previous prime is 1012152179. The next prime is 1012152277. The reversal of 1012152221 is 1222512101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 668791321 + 343360900 = 25861^2 + 18530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012152221 - 2⁶ = 1012152157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1012152221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012152121) 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, 24440 + ... + 51201.

It is an arithmetic number, because the mean of its divisors is an integer number (253060311).

Almost surely, 2^1012152221 is an apocalyptic number.

It is an amenable number.

1012152221 is a deficient number, since it is larger than the sum of its proper divisors (89023).

1012152221 is an equidigital number, since it uses as much as digits as its factorization.

1012152221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89022.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1012152221 is about 31814.3398642813. The cubic root of 1012152221 is about 1004.0344417241.

Adding to 1012152221 its reverse (1222512101), we get a palindrome (2234664322).

The spelling of 1012152221 in words is "one billion, twelve million, one hundred fifty-two thousand, two hundred twenty-one".