1031012221 has 4 divisors (see below), whose sum is σ = 1031166972. Its totient is φ = 1030857472.

The previous prime is 1031012201. The next prime is 1031012231. The reversal of 1031012221 is 1222101301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222101301 = 313 ⋅3904477.

It can be written as a sum of positive squares in 2 ways, for example, as 636552900 + 394459321 = 25230^2 + 19861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031012221 - 2⁵ = 1031012189 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 (1031012201) 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, 66910 + ... + 80863.

It is an arithmetic number, because the mean of its divisors is an integer number (257791743).

Almost surely, 2^1031012221 is an apocalyptic number.

It is an amenable number.

1031012221 is a deficient number, since it is larger than the sum of its proper divisors (154751).

1031012221 is an equidigital number, since it uses as much as digits as its factorization.

1031012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154750.

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

The square root of 1031012221 is about 32109.3790192212. The cubic root of 1031012221 is about 1010.2323489232.

Adding to 1031012221 its reverse (1222101301), we get a palindrome (2253113522).

The spelling of 1031012221 in words is "one billion, thirty-one million, twelve thousand, two hundred twenty-one".