1321669420 has 48 divisors (see below), whose sum is σ = 2941753248. Its totient is φ = 497064960.

The previous prime is 1321669411. The next prime is 1321669423. The reversal of 1321669420 is 249661231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (1321669423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 656215 + ... + 658225.

It is an arithmetic number, because the mean of its divisors is an integer number (61286526).

Almost surely, 2^1321669420 is an apocalyptic number.

1321669420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321669420 is an abundant number, since it is smaller than the sum of its proper divisors (1620083828).

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

1321669420 is a wasteful number, since it uses less digits than its factorization.

1321669420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970 (or 3968 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1321669420 is about 36354.7716262941. The cubic root of 1321669420 is about 1097.4235624247.

The spelling of 1321669420 in words is "one billion, three hundred twenty-one million, six hundred sixty-nine thousand, four hundred twenty".