1323140021 has 16 divisors (see below), whose sum is σ = 1580491008. Its totient is φ = 1083033600.

The previous prime is 1323140009. The next prime is 1323140029. The reversal of 1323140021 is 1200413231.

It is a de Polignac number, because none of the positive numbers 2^k-1323140021 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 (1323140029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96791 + ... + 109611.

It is an arithmetic number, because the mean of its divisors is an integer number (98780688).

Almost surely, 2^1323140021 is an apocalyptic number.

It is an amenable number.

1323140021 is a deficient number, since it is larger than the sum of its proper divisors (257350987).

1323140021 is a wasteful number, since it uses less digits than its factorization.

1323140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13492.

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

The square root of 1323140021 is about 36374.9916975936. The cubic root of 1323140021 is about 1097.8304402608.

Adding to 1323140021 its reverse (1200413231), we get a palindrome (2523553252).

The spelling of 1323140021 in words is "one billion, three hundred twenty-three million, one hundred forty thousand, twenty-one".