1021255660 has 36 divisors (see below), whose sum is σ = 2241959328. Its totient is φ = 390737248.

The previous prime is 1021255639. The next prime is 1021255663. The reversal of 1021255660 is 665521201.

It is not an unprimeable number, because it can be changed into a prime (1021255663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37684 + ... + 58843.

It is an arithmetic number, because the mean of its divisors is an integer number (62276648).

Almost surely, 2^1021255660 is an apocalyptic number.

1021255660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021255660 is an abundant number, since it is smaller than the sum of its proper divisors (1220703668).

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

1021255660 is a wasteful number, since it uses less digits than its factorization.

1021255660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96582 (or 96557 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1021255660 is about 31957.0909189181. The cubic root of 1021255660 is about 1007.0356041869.

Adding to 1021255660 its reverse (665521201), we get a palindrome (1686776861).

The spelling of 1021255660 in words is "one billion, twenty-one million, two hundred fifty-five thousand, six hundred sixty".