1321265022 has 64 divisors (see below), whose sum is σ = 3305470464. Its totient is φ = 342051840.

The previous prime is 1321265021. The next prime is 1321265039. The reversal of 1321265022 is 2205621231.

It is a junction number, because it is equal to n+sod(n) for n = 1321264983 and 1321265001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321265021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140038 + ... + 149174.

It is an arithmetic number, because the mean of its divisors is an integer number (51647976).

Almost surely, 2^1321265022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321265022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1652735232).

1321265022 is an abundant number, since it is smaller than the sum of its proper divisors (1984205442).

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

1321265022 is a wasteful number, since it uses less digits than its factorization.

1321265022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1321265022 is about 36349.2093724196. The cubic root of 1321265022 is about 1097.3116228937.

Adding to 1321265022 its reverse (2205621231), we get a palindrome (3526886253).

The spelling of 1321265022 in words is "one billion, three hundred twenty-one million, two hundred sixty-five thousand, twenty-two".