1313234021 has 4 divisors (see below), whose sum is σ = 1432618944. Its totient is φ = 1193849100.

The previous prime is 1313233991. The next prime is 1313234023. The reversal of 1313234021 is 1204323131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313234021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1313233984 and 1313234002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313234023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59692445 + ... + 59692466.

It is an arithmetic number, because the mean of its divisors is an integer number (358154736).

Almost surely, 2^1313234021 is an apocalyptic number.

1313234021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1313234021 is a deficient number, since it is larger than the sum of its proper divisors (119384923).

1313234021 is a wasteful number, since it uses less digits than its factorization.

1313234021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119384922.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1313234021 is about 36238.5709017340. The cubic root of 1313234021 is about 1095.0838522694.

Adding to 1313234021 its reverse (1204323131), we get a palindrome (2517557152).

The spelling of 1313234021 in words is "one billion, three hundred thirteen million, two hundred thirty-four thousand, twenty-one".