2001211236 has 72 divisors (see below), whose sum is σ = 5540928120. Its totient is φ = 606176256.

The previous prime is 2001211181. The next prime is 2001211237. The reversal of 2001211236 is 6321121002.

It can be written as a sum of positive squares in 4 ways, for example, as 606636900 + 1394574336 = 24630^2 + 37344^2 .

It is a super-2 number, since 2×2001211236² = 8009692822185295392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2001211237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38631 + ... + 74126.

It is an arithmetic number, because the mean of its divisors is an integer number (76957335).

Almost surely, 2^2001211236 is an apocalyptic number.

It is an amenable number.

2001211236 is an abundant number, since it is smaller than the sum of its proper divisors (3539716884).

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

2001211236 is a wasteful number, since it uses less digits than its factorization.

2001211236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112813 (or 112808 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2001211236 is about 44734.8995304561. The cubic root of 2001211236 is about 1260.1753421892.

Adding to 2001211236 its reverse (6321121002), we get a palindrome (8322332238).

The spelling of 2001211236 in words is "two billion, one million, two hundred eleven thousand, two hundred thirty-six".