1313042021 has 8 divisors (see below), whose sum is σ = 1332437784. Its totient is φ = 1293684480.

The previous prime is 1313041973. The next prime is 1313042053. The reversal of 1313042021 is 1202403131.

It can be written as a sum of positive squares in 4 ways, for example, as 142444225 + 1170597796 = 11935^2 + 34214^2 .

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 1313042021 - 2¹⁸ = 1312779877 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 (1313044021) 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, 63761 + ... + 81801.

It is an arithmetic number, because the mean of its divisors is an integer number (166554723).

Almost surely, 2^1313042021 is an apocalyptic number.

It is an amenable number.

1313042021 is a deficient number, since it is larger than the sum of its proper divisors (19395763).

1313042021 is an equidigital number, since it uses as much as digits as its factorization.

1313042021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19111.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1313042021 is about 36235.9216938110. The cubic root of 1313042021 is about 1095.0304811403.

Adding to 1313042021 its reverse (1202403131), we get a palindrome (2515445152).

The spelling of 1313042021 in words is "one billion, three hundred thirteen million, forty-two thousand, twenty-one".