1321105420 has 24 divisors (see below), whose sum is σ = 2777879664. Its totient is φ = 527764416.

The previous prime is 1321105399. The next prime is 1321105447. The reversal of 1321105420 is 245011231.

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, 26227 + ... + 57706.

It is an arithmetic number, because the mean of its divisors is an integer number (115744986).

Almost surely, 2^1321105420 is an apocalyptic number.

1321105420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321105420 is an abundant number, since it is smaller than the sum of its proper divisors (1456774244).

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

1321105420 is a wasteful number, since it uses less digits than its factorization.

1321105420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84729 (or 84727 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1321105420 is about 36347.0139076101. The cubic root of 1321105420 is about 1097.2674379197.

Adding to 1321105420 its reverse (245011231), we get a palindrome (1566116651).

The spelling of 1321105420 in words is "one billion, three hundred twenty-one million, one hundred five thousand, four hundred twenty".