1021332090 has 64 divisors (see below), whose sum is σ = 2571139584. Its totient is φ = 259342848.

The previous prime is 1021332079. The next prime is 1021332113. The reversal of 1021332090 is 902331201.

It is a happy number.

1021332090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42382 + ... + 61958.

It is an arithmetic number, because the mean of its divisors is an integer number (40174056).

Almost surely, 2^1021332090 is an apocalyptic number.

1021332090 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 1021332090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285569792).

1021332090 is an abundant number, since it is smaller than the sum of its proper divisors (1549807494).

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

1021332090 is a wasteful number, since it uses less digits than its factorization.

1021332090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19671.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1021332090 is about 31958.2867187839. The cubic root of 1021332090 is about 1007.0607254875.

Adding to 1021332090 its reverse (902331201), we get a palindrome (1923663291).

The spelling of 1021332090 in words is "one billion, twenty-one million, three hundred thirty-two thousand, ninety".