1320340021 has 40 divisors (see below), whose sum is σ = 1789329920. Its totient is φ = 948736800.

The previous prime is 1320340019. The next prime is 1320340117. The reversal of 1320340021 is 1200430231.

It is a happy number.

It is not a de Polignac number, because 1320340021 - 2¹ = 1320340019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320339977 and 1320340004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320343021) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1331836 + ... + 1332826.

It is an arithmetic number, because the mean of its divisors is an integer number (44733248).

Almost surely, 2^1320340021 is an apocalyptic number.

1320340021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1320340021 is a deficient number, since it is larger than the sum of its proper divisors (468989899).

1320340021 is an frugal number, since it uses more digits than its factorization.

1320340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1320340021 is about 36336.4833328708. The cubic root of 1320340021 is about 1097.0554917643.

Adding to 1320340021 its reverse (1200430231), we get a palindrome (2520770252).

The spelling of 1320340021 in words is "one billion, three hundred twenty million, three hundred forty thousand, twenty-one".