1321821248 has 56 divisors (see below), whose sum is σ = 2889382080. Its totient is φ = 594961920.

The previous prime is 1321821209. The next prime is 1321821251. The reversal of 1321821248 is 8421281231.

It is a super-2 number, since 2×1321821248² = 3494422823328555008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 63398 + ... + 81626.

Almost surely, 2^1321821248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321821248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444691040).

1321821248 is an abundant number, since it is smaller than the sum of its proper divisors (1567560832).

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

1321821248 is a wasteful number, since it uses less digits than its factorization.

1321821248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18355 (or 18345 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 1321821248 is about 36356.8597103765. The cubic root of 1321821248 is about 1097.4655833321.

The spelling of 1321821248 in words is "one billion, three hundred twenty-one million, eight hundred twenty-one thousand, two hundred forty-eight".