1321340220 has 36 divisors (see below), whose sum is σ = 4008065880. Its totient is φ = 352357344.

The previous prime is 1321340219. The next prime is 1321340221. The reversal of 1321340220 is 220431231.

1321340220 is a `hidden beast` number, since 1 + 321 + 340 + 2 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1321340219) and next prime (1321340221).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1321340193 and 1321340202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321340221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3670210 + ... + 3670569.

Almost surely, 2^1321340220 is an apocalyptic number.

1321340220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321340220 is an abundant number, since it is smaller than the sum of its proper divisors (2686725660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321340220 is a wasteful number, since it uses less digits than its factorization.

1321340220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7340794 (or 7340789 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1321340220 is about 36350.2437405858. The cubic root of 1321340220 is about 1097.3324398312.

Adding to 1321340220 its reverse (220431231), we get a palindrome (1541771451).

The spelling of 1321340220 in words is "one billion, three hundred twenty-one million, three hundred forty thousand, two hundred twenty".