1131023021 has 8 divisors (see below), whose sum is σ = 1171257624. Its totient is φ = 1091488320.

The previous prime is 1131023009. The next prime is 1131023053. The reversal of 1131023021 is 1203201311.

It can be written as a sum of positive squares in 4 ways, for example, as 266016100 + 865006921 = 16310^2 + 29411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131023021 - 2⁶ = 1131022957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131022987 and 1131023005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131020021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171686 + ... + 178151.

It is an arithmetic number, because the mean of its divisors is an integer number (146407203).

Almost surely, 2^1131023021 is an apocalyptic number.

It is an amenable number.

1131023021 is a deficient number, since it is larger than the sum of its proper divisors (40234603).

1131023021 is an equidigital number, since it uses as much as digits as its factorization.

1131023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349951.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1131023021 is about 33630.6857051711. The cubic root of 1131023021 is about 1041.8946665874.

Adding to 1131023021 its reverse (1203201311), we get a palindrome (2334224332).

The spelling of 1131023021 in words is "one billion, one hundred thirty-one million, twenty-three thousand, twenty-one".