1321201420 has 144 divisors (see below), whose sum is σ = 3637960704. Its totient is φ = 393782400.

The previous prime is 1321201391. The next prime is 1321201421. The reversal of 1321201420 is 241021231.

It is a junction number, because it is equal to n+sod(n) for n = 1321201394 and 1321201403.

It is not an unprimeable number, because it can be changed into a prime (1321201421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 387925 + ... + 391315.

It is an arithmetic number, because the mean of its divisors is an integer number (25263616).

Almost surely, 2^1321201420 is an apocalyptic number.

1321201420 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 1321201420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1818980352).

1321201420 is an abundant number, since it is smaller than the sum of its proper divisors (2316759284).

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

1321201420 is a wasteful number, since it uses less digits than its factorization.

1321201420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452 (or 3439 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1321201420 is about 36348.3344872912. The cubic root of 1321201420 is about 1097.2940154411.

Adding to 1321201420 its reverse (241021231), we get a palindrome (1562222651).

The spelling of 1321201420 in words is "one billion, three hundred twenty-one million, two hundred one thousand, four hundred twenty".