1321001010 has 96 divisors (see below), whose sum is σ = 4031419392. Its totient is φ = 293777280.

The previous prime is 1321000981. The next prime is 1321001023. The reversal of 1321001010 is 101001231.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1321000983 and 1321001001.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5026 + ... + 51645.

It is an arithmetic number, because the mean of its divisors is an integer number (41993952).

Almost surely, 2^1321001010 is an apocalyptic number.

1321001010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321001010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2015709696).

1321001010 is an abundant number, since it is smaller than the sum of its proper divisors (2710418382).

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

1321001010 is a wasteful number, since it uses less digits than its factorization.

1321001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56728 (or 56725 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1321001010 is about 36345.5775851753. The cubic root of 1321001010 is about 1097.2385306350.

Adding to 1321001010 its reverse (101001231), we get a palindrome (1422002241).

The spelling of 1321001010 in words is "one billion, three hundred twenty-one million, one thousand, ten".