1321301020 has 48 divisors (see below), whose sum is σ = 3019036608. Its totient is φ = 482826240.

The previous prime is 1321300963. The next prime is 1321301027. The reversal of 1321301020 is 201031231.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321301027) 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, 976 + ... + 51415.

It is an arithmetic number, because the mean of its divisors is an integer number (62896596).

Almost surely, 2^1321301020 is an apocalyptic number.

1321301020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321301020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509518304).

1321301020 is an abundant number, since it is smaller than the sum of its proper divisors (1697735588).

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

1321301020 is a wasteful number, since it uses less digits than its factorization.

1321301020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52510 (or 52508 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1321301020 is about 36349.7045380014. The cubic root of 1321301020 is about 1097.3215882588.

Adding to 1321301020 its reverse (201031231), we get a palindrome (1522332251).

The spelling of 1321301020 in words is "one billion, three hundred twenty-one million, three hundred one thousand, twenty".