1021305140 has 12 divisors (see below), whose sum is σ = 2144740836. Its totient is φ = 408522048.

The previous prime is 1021305139. The next prime is 1021305149. The reversal of 1021305140 is 415031201.

It can be written as a sum of positive squares in 2 ways, for example, as 392198416 + 629106724 = 19804^2 + 25082^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021305149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25532609 + ... + 25532648.

It is an arithmetic number, because the mean of its divisors is an integer number (178728403).

Almost surely, 2^1021305140 is an apocalyptic number.

1021305140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021305140 is an abundant number, since it is smaller than the sum of its proper divisors (1123435696).

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

1021305140 is a wasteful number, since it uses less digits than its factorization.

1021305140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51065266 (or 51065264 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1021305140 is about 31957.8650726234. The cubic root of 1021305140 is about 1007.0518676029.

Adding to 1021305140 its reverse (415031201), we get a palindrome (1436336341).

The spelling of 1021305140 in words is "one billion, twenty-one million, three hundred five thousand, one hundred forty".