1001211012 has 18 divisors (see below), whose sum is σ = 2530839038. Its totient is φ = 333736992.

The previous prime is 1001210981. The next prime is 1001211017. The reversal of 1001211012 is 2101121001.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 537497856 + 463713156 = 23184^2 + 21534^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1001210985 and 1001211003.

It is not an unprimeable number, because it can be changed into a prime (1001211017) 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, 13905673 + ... + 13905744.

Almost surely, 2^1001211012 is an apocalyptic number.

1001211012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1001211012 is an abundant number, since it is smaller than the sum of its proper divisors (1529628026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001211012 is a wasteful number, since it uses less digits than its factorization.

1001211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27811427 (or 27811422 counting only the distinct ones).

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

The square root of 1001211012 is about 31641.9185891121. The cubic root of 1001211012 is about 1000.4035078262.

Adding to 1001211012 its reverse (2101121001), we get a palindrome (3102332013).

The spelling of 1001211012 in words is "one billion, one million, two hundred eleven thousand, twelve".