1321341020 has 24 divisors (see below), whose sum is σ = 2796670464. Its totient is φ = 524373696.

The previous prime is 1321341017. The next prime is 1321341041. The reversal of 1321341020 is 201431231.

It is a super-2 number, since 2×1321341020² = 3491884182269280800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321341020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257567 + ... + 262646.

It is an arithmetic number, because the mean of its divisors is an integer number (116527936).

Almost surely, 2^1321341020 is an apocalyptic number.

1321341020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321341020 is an abundant number, since it is smaller than the sum of its proper divisors (1475329444).

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

1321341020 is a wasteful number, since it uses less digits than its factorization.

1321341020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520349 (or 520347 counting only the distinct ones).

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

The square root of 1321341020 is about 36350.2547446369. The cubic root of 1321341020 is about 1097.3326612896.

Adding to 1321341020 its reverse (201431231), we get a palindrome (1522772251).

The spelling of 1321341020 in words is "one billion, three hundred twenty-one million, three hundred forty-one thousand, twenty".