1321302402 has 128 divisors (see below), whose sum is σ = 3458142720. Its totient is φ = 366163200.

The previous prime is 1321302401. The next prime is 1321302421. The reversal of 1321302402 is 2042031231.

1321302402 is a `hidden beast` number, since 1 + 321 + 302 + 40 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1321302401) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2023108 + ... + 2023760.

It is an arithmetic number, because the mean of its divisors is an integer number (27016740).

Almost surely, 2^1321302402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321302402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1729071360).

1321302402 is an abundant number, since it is smaller than the sum of its proper divisors (2136840318).

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

1321302402 is a wasteful number, since it uses less digits than its factorization.

1321302402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 819 counting only the distinct ones).

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

The square root of 1321302402 is about 36349.7235477796. The cubic root of 1321302402 is about 1097.3219708357.

Adding to 1321302402 its reverse (2042031231), we get a palindrome (3363333633).

The spelling of 1321302402 in words is "one billion, three hundred twenty-one million, three hundred two thousand, four hundred two".