1131311123021 has 8 divisors (see below), whose sum is σ = 1134083575800. Its totient is φ = 1128540974080.

The previous prime is 1131311122999. The next prime is 1131311123029. The reversal of 1131311123021 is 1203211131311.

It can be written as a sum of positive squares in 4 ways, for example, as 37904196100 + 1093406926921 = 194690^2 + 1045661^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131311123021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131311122984 and 1131311123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131311123029) 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, 409415 + ... + 1558923.

It is an arithmetic number, because the mean of its divisors is an integer number (141760446975).

Almost surely, 2^{1131311123021} is an apocalyptic number.

It is an amenable number.

1131311123021 is a deficient number, since it is larger than the sum of its proper divisors (2772452779).

1131311123021 is a wasteful number, since it uses less digits than its factorization.

1131311123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151919.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 1131311123021 its reverse (1203211131311), we get a palindrome (2334522254332).

The spelling of 1131311123021 in words is "one trillion, one hundred thirty-one billion, three hundred eleven million, one hundred twenty-three thousand, twenty-one".