1321021131 has 16 divisors (see below), whose sum is σ = 1804032000. Its totient is φ = 859520480.

The previous prime is 1321021129. The next prime is 1321021133. The reversal of 1321021131 is 1311201231.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1321021129) and next prime (1321021133).

It is a cyclic number.

It is not a de Polignac number, because 1321021131 - 2¹ = 1321021129 is a prime.

It is a super-2 number, since 2×1321021131² = 3490193657097038322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321021131.

It is not an unprimeable number, because it can be changed into a prime (1321021133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8620 + ... + 52118.

It is an arithmetic number, because the mean of its divisors is an integer number (112752000).

Almost surely, 2^1321021131 is an apocalyptic number.

1321021131 is a deficient number, since it is larger than the sum of its proper divisors (483010869).

1321021131 is a wasteful number, since it uses less digits than its factorization.

1321021131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43746.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1321021131 is about 36345.8543853353. The cubic root of 1321021131 is about 1097.2441015176.

Adding to 1321021131 its reverse (1311201231), we get a palindrome (2632222362).

The spelling of 1321021131 in words is "one billion, three hundred twenty-one million, twenty-one thousand, one hundred thirty-one".