1021310090 has 16 divisors (see below), whose sum is σ = 1857312072. Its totient is φ = 404312064.

The previous prime is 1021310089. The next prime is 1021310107. The reversal of 1021310090 is 900131201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 667757281 + 353552809 = 25841^2 + 18803^2 .

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 7 ways as a sum of consecutive naturals, for example, 525479 + ... + 527418.

Almost surely, 2^1021310090 is an apocalyptic number.

1021310090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021310090 is a deficient number, since it is larger than the sum of its proper divisors (836001982).

1021310090 is a wasteful number, since it uses less digits than its factorization.

1021310090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053001.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1021310090 is about 31957.9425182536. The cubic root of 1021310090 is about 1007.0534945730.

Adding to 1021310090 its reverse (900131201), we get a palindrome (1921441291).

The spelling of 1021310090 in words is "one billion, twenty-one million, three hundred ten thousand, ninety".