1131100021 has 8 divisors (see below), whose sum is σ = 1183253400. Its totient is φ = 1079823360.

The previous prime is 1131099997. The next prime is 1131100031. The reversal of 1131100021 is 1200011311.

It can be written as a sum of positive squares in 4 ways, for example, as 246929796 + 884170225 = 15714^2 + 29735^2 .

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 1131100021 - 2⁵ = 1131099989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131099980 and 1131100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131100031) 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, 216540 + ... + 221701.

It is an arithmetic number, because the mean of its divisors is an integer number (147906675).

Almost surely, 2^1131100021 is an apocalyptic number.

It is an amenable number.

1131100021 is a deficient number, since it is larger than the sum of its proper divisors (52153379).

1131100021 is an equidigital number, since it uses as much as digits as its factorization.

1131100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438359.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1131100021 is about 33631.8304735261. The cubic root of 1131100021 is about 1041.9183100993.

Adding to 1131100021 its reverse (1200011311), we get a palindrome (2331111332).

The spelling of 1131100021 in words is "one billion, one hundred thirty-one million, one hundred thousand, twenty-one".