1021397210 has 24 divisors (see below), whose sum is σ = 1889572860. Its totient is φ = 397511424.

The previous prime is 1021397183. The next prime is 1021397227. The reversal of 1021397210 is 127931201.

1021397210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1011176401 + 10220809 = 31799^2 + 3197^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1021397210.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23615 + ... + 50994.

Almost surely, 2^1021397210 is an apocalyptic number.

1021397210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021397210 is a deficient number, since it is larger than the sum of its proper divisors (868175650).

1021397210 is an equidigital number, since it uses as much as digits as its factorization.

1021397210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74690 (or 74653 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 1021397210 is about 31959.3055306275. The cubic root of 1021397210 is about 1007.0821283858.

The spelling of 1021397210 in words is "one billion, twenty-one million, three hundred ninety-seven thousand, two hundred ten".