1021225660 has 144 divisors (see below), whose sum is σ = 2726861760. Its totient is φ = 318366720.

The previous prime is 1021225657. The next prime is 1021225697. The reversal of 1021225660 is 665221201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 903976 + ... + 905104.

It is an arithmetic number, because the mean of its divisors is an integer number (18936540).

Almost surely, 2^1021225660 is an apocalyptic number.

1021225660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021225660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1363430880).

1021225660 is an abundant number, since it is smaller than the sum of its proper divisors (1705636100).

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

1021225660 is a wasteful number, since it uses less digits than its factorization.

1021225660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1021225660 is about 31956.6215360761. The cubic root of 1021225660 is about 1007.0257433312.

Adding to 1021225660 its reverse (665221201), we get a palindrome (1686446861).

The spelling of 1021225660 in words is "one billion, twenty-one million, two hundred twenty-five thousand, six hundred sixty".