1021221113 has 4 divisors (see below), whose sum is σ = 1114059408. Its totient is φ = 928382820.

The previous prime is 1021221077. The next prime is 1021221133. The reversal of 1021221113 is 3111221201.

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 1021221113 - 2⁸ = 1021220857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021221133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46419131 + ... + 46419152.

It is an arithmetic number, because the mean of its divisors is an integer number (278514852).

Almost surely, 2^1021221113 is an apocalyptic number.

It is an amenable number.

1021221113 is a deficient number, since it is larger than the sum of its proper divisors (92838295).

1021221113 is an equidigital number, since it uses as much as digits as its factorization.

1021221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92838294.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1021221113 is about 31956.5503926816. The cubic root of 1021221113 is about 1007.0242487374.

Adding to 1021221113 its reverse (3111221201), we get a palindrome (4132442314).

The spelling of 1021221113 in words is "one billion, twenty-one million, two hundred twenty-one thousand, one hundred thirteen".