1012221121 has 2 divisors, whose sum is σ = 1012221122. Its totient is φ = 1012221120.

The previous prime is 1012221113. The next prime is 1012221127. The reversal of 1012221121 is 1211222101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1012194225 + 26896 = 31815^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012221121 - 2³ = 1012221113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1012221127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506110560 + 506110561.

It is an arithmetic number, because the mean of its divisors is an integer number (506110561).

Almost surely, 2^1012221121 is an apocalyptic number.

It is an amenable number.

1012221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012221121 is an equidigital number, since it uses as much as digits as its factorization.

1012221121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1012221121 is about 31815.4226908900. The cubic root of 1012221121 is about 1004.0572236740.

Adding to 1012221121 its reverse (1211222101), we get a palindrome (2223443222).

It can be divided in two parts, 101 and 2221121, that added together give a palindrome (2221222).

The spelling of 1012221121 in words is "one billion, twelve million, two hundred twenty-one thousand, one hundred twenty-one".