1321100420 has 12 divisors (see below), whose sum is σ = 2774310924. Its totient is φ = 528440160.

The previous prime is 1321100399. The next prime is 1321100441. The reversal of 1321100420 is 240011231.

It is an interprime number because it is at equal distance from previous prime (1321100399) and next prime (1321100441).

It can be written as a sum of positive squares in 2 ways, for example, as 623401024 + 697699396 = 24968^2 + 26414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1321100395 and 1321100404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33027491 + ... + 33027530.

It is an arithmetic number, because the mean of its divisors is an integer number (231192577).

Almost surely, 2^1321100420 is an apocalyptic number.

1321100420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321100420 is an abundant number, since it is smaller than the sum of its proper divisors (1453210504).

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

1321100420 is a wasteful number, since it uses less digits than its factorization.

1321100420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66055030 (or 66055028 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1321100420 is about 36346.9451261038. The cubic root of 1321100420 is about 1097.2660536385.

Adding to 1321100420 its reverse (240011231), we get a palindrome (1561111651).

The spelling of 1321100420 in words is "one billion, three hundred twenty-one million, one hundred thousand, four hundred twenty".