1321654420 has 12 divisors (see below), whose sum is σ = 2775474324. Its totient is φ = 528661760.

The previous prime is 1321654357. The next prime is 1321654427. The reversal of 1321654420 is 244561231.

It can be written as a sum of positive squares in 2 ways, for example, as 624800016 + 696854404 = 24996^2 + 26398^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321654427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33041341 + ... + 33041380.

It is an arithmetic number, because the mean of its divisors is an integer number (231289527).

Almost surely, 2^1321654420 is an apocalyptic number.

1321654420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321654420 is an abundant number, since it is smaller than the sum of its proper divisors (1453819904).

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

1321654420 is a wasteful number, since it uses less digits than its factorization.

1321654420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66082730 (or 66082728 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1321654420 is about 36354.5653254168. The cubic root of 1321654420 is about 1097.4194107522.

The spelling of 1321654420 in words is "one billion, three hundred twenty-one million, six hundred fifty-four thousand, four hundred twenty".