1031000221 has 4 divisors (see below), whose sum is σ = 1046388352. Its totient is φ = 1015612092.

The previous prime is 1031000219. The next prime is 1031000251. The reversal of 1031000221 is 1220001301.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1220001301 = 97 ⋅12577333.

It is a cyclic number.

It is not a de Polignac number, because 1031000221 - 2¹ = 1031000219 is a prime.

It is a super-2 number, since 2×1031000221² = 2125922911404097682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031000198 and 1031000207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031000251) 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, 7693965 + ... + 7694098.

It is an arithmetic number, because the mean of its divisors is an integer number (261597088).

Almost surely, 2^1031000221 is an apocalyptic number.

It is an amenable number.

1031000221 is a deficient number, since it is larger than the sum of its proper divisors (15388131).

1031000221 is an equidigital number, since it uses as much as digits as its factorization.

1031000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15388130.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1031000221 is about 32109.1921573870. The cubic root of 1031000221 is about 1010.2284295273.

Adding to 1031000221 its reverse (1220001301), we get a palindrome (2251001522).

The spelling of 1031000221 in words is "one billion, thirty-one million, two hundred twenty-one", and thus it is an aban number.