1001012211 has 6 divisors (see below), whose sum is σ = 1445906540. Its totient is φ = 667341468.

The previous prime is 1001012203. The next prime is 1001012237. The reversal of 1001012211 is 1122101001.

It is a happy number.

It is not a de Polignac number, because 1001012211 - 2³ = 1001012203 is a prime.

It is a super-2 number, since 2×1001012211² = 2004050893142217042, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 111223579 = 1001012211 / (1 + 0 + 0 + 1 + 0 + 1 + 2 + 2 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001012193 and 1001012202.

It is not an unprimeable number, because it can be changed into a prime (1001012711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55611781 + ... + 55611798.

Almost surely, 2^1001012211 is an apocalyptic number.

1001012211 is a deficient number, since it is larger than the sum of its proper divisors (444894329).

1001012211 is a wasteful number, since it uses less digits than its factorization.

1001012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111223585 (or 111223582 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1001012211 is about 31638.7770149227. Note that the first 3 decimals coincide. The cubic root of 1001012211 is about 1000.3372898894.

Adding to 1001012211 its reverse (1122101001), we get a palindrome (2123113212).

The spelling of 1001012211 in words is "one billion, one million, twelve thousand, two hundred eleven".