1001021205 has 32 divisors (see below), whose sum is σ = 1630015488. Its totient is φ = 524462400.

The previous prime is 1001021179. The next prime is 1001021233. The reversal of 1001021205 is 5021201001.

It is not a de Polignac number, because 1001021205 - 2⁶ = 1001021141 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432000 + ... + 434310.

It is an arithmetic number, because the mean of its divisors is an integer number (50937984).

Almost surely, 2^1001021205 is an apocalyptic number.

1001021205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1001021205 is a deficient number, since it is larger than the sum of its proper divisors (628994283).

1001021205 is a wasteful number, since it uses less digits than its factorization.

1001021205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817.

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

The square root of 1001021205 is about 31638.9191503123. The cubic root of 1001021205 is about 1000.3402858591.

Adding to 1001021205 its reverse (5021201001), we get a palindrome (6022222206).

The spelling of 1001021205 in words is "one billion, one million, twenty-one thousand, two hundred five".