1320213821 has 8 divisors (see below), whose sum is σ = 1357782624. Its totient is φ = 1282957200.

The previous prime is 1320213787. The next prime is 1320213847. The reversal of 1320213821 is 1283120231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1320213821 - 2¹⁰ = 1320212797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320213721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69455 + ... + 86396.

It is an arithmetic number, because the mean of its divisors is an integer number (169722828).

Almost surely, 2^1320213821 is an apocalyptic number.

It is an amenable number.

1320213821 is a deficient number, since it is larger than the sum of its proper divisors (37568803).

1320213821 is a wasteful number, since it uses less digits than its factorization.

1320213821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156091.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1320213821 is about 36334.7467446795. The cubic root of 1320213821 is about 1097.0205379362.

The spelling of 1320213821 in words is "one billion, three hundred twenty million, two hundred thirteen thousand, eight hundred twenty-one".