1021021005 has 16 divisors (see below), whose sum is σ = 1636151040. Its totient is φ = 543705408.

The previous prime is 1021020961. The next prime is 1021021007. The reversal of 1021021005 is 5001201201.

It is not a de Polignac number, because 1021021005 - 2¹³ = 1021012813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42325 + ... + 61914.

It is an arithmetic number, because the mean of its divisors is an integer number (102259440).

Almost surely, 2^1021021005 is an apocalyptic number.

1021021005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021021005 is a deficient number, since it is larger than the sum of its proper divisors (615130035).

1021021005 is a wasteful number, since it uses less digits than its factorization.

1021021005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104900.

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

The square root of 1021021005 is about 31953.4193006007. The cubic root of 1021021005 is about 1006.9584690646.

Adding to 1021021005 its reverse (5001201201), we get a palindrome (6022222206).

The spelling of 1021021005 in words is "one billion, twenty-one million, twenty-one thousand, five".