1001212005 has 48 divisors (see below), whose sum is σ = 1672274880. Its totient is φ = 511365120.

The previous prime is 1001211989. The next prime is 1001212013. The reversal of 1001212005 is 5002121001.

It is not a de Polignac number, because 1001212005 - 2⁴ = 1001211989 is a prime.

It is a super-2 number, since 2×1001212005² = 2004850957912240050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1487349 + ... + 1488021.

It is an arithmetic number, because the mean of its divisors is an integer number (34839060).

Almost surely, 2^1001212005 is an apocalyptic number.

1001212005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1001212005 is a deficient number, since it is larger than the sum of its proper divisors (671062875).

1001212005 is an equidigital number, since it uses as much as digits as its factorization.

1001212005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 781 counting only the distinct ones).

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

The square root of 1001212005 is about 31641.9342803186. The cubic root of 1001212005 is about 1000.4038385591.

Adding to 1001212005 its reverse (5002121001), we get a palindrome (6003333006).

The spelling of 1001212005 in words is "one billion, one million, two hundred twelve thousand, five".