1021210005 has 64 divisors (see below), whose sum is σ = 1817303040. Its totient is φ = 487339776.

The previous prime is 1021209997. The next prime is 1021210007. The reversal of 1021210005 is 5000121201.

It is not a de Polignac number, because 1021210005 - 2³ = 1021209997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210007) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 543127 + ... + 545003.

It is an arithmetic number, because the mean of its divisors is an integer number (28395360).

Almost surely, 2^1021210005 is an apocalyptic number.

1021210005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021210005 is a deficient number, since it is larger than the sum of its proper divisors (796093035).

1021210005 is a wasteful number, since it uses less digits than its factorization.

1021210005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1021210005 is about 31956.3765937254. The cubic root of 1021210005 is about 1007.0205975314.

Adding to 1021210005 its reverse (5000121201), we get a palindrome (6021331206).

The spelling of 1021210005 in words is "one billion, twenty-one million, two hundred ten thousand, five".