1013021221 has 4 divisors (see below), whose sum is σ = 1034574912. Its totient is φ = 991467532.

The previous prime is 1013021203. The next prime is 1013021231. The reversal of 1013021221 is 1221203101.

1013021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1013021221 - 2⁹ = 1013020709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013021231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10776775 + ... + 10776868.

It is an arithmetic number, because the mean of its divisors is an integer number (258643728).

Almost surely, 2^1013021221 is an apocalyptic number.

It is an amenable number.

1013021221 is a deficient number, since it is larger than the sum of its proper divisors (21553691).

1013021221 is an equidigital number, since it uses as much as digits as its factorization.

1013021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21553690.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1013021221 is about 31827.9942974734. The cubic root of 1013021221 is about 1004.3217029777.

Adding to 1013021221 its reverse (1221203101), we get a palindrome (2234224322).

The spelling of 1013021221 in words is "one billion, thirteen million, twenty-one thousand, two hundred twenty-one".