1011320221 has 4 divisors (see below), whose sum is σ = 1012058172. Its totient is φ = 1010582272.

The previous prime is 1011320213. The next prime is 1011320243. The reversal of 1011320221 is 1220231101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220231101 = 1019 ⋅1197479.

It can be written as a sum of positive squares in 2 ways, for example, as 755480196 + 255840025 = 27486^2 + 15995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011320221 - 2³ = 1011320213 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 (1011320621) 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, 366916 + ... + 369661.

It is an arithmetic number, because the mean of its divisors is an integer number (253014543).

Almost surely, 2^1011320221 is an apocalyptic number.

It is an amenable number.

1011320221 is a deficient number, since it is larger than the sum of its proper divisors (737951).

1011320221 is an equidigital number, since it uses as much as digits as its factorization.

1011320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737950.

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

The square root of 1011320221 is about 31801.2613114637. The cubic root of 1011320221 is about 1003.7592572761.

Adding to 1011320221 its reverse (1220231101), we get a palindrome (2231551322).

The spelling of 1011320221 in words is "one billion, eleven million, three hundred twenty thousand, two hundred twenty-one".