2001211216 has 20 divisors (see below), whose sum is σ = 3878492832. Its totient is φ = 1000309856.

The previous prime is 2001211181. The next prime is 2001211237. The reversal of 2001211216 is 6121121002.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a self number, because there is not a number n which added to its sum of digits gives 2001211216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43671 + ... + 76873.

Almost surely, 2^2001211216 is an apocalyptic number.

It is an amenable number.

2001211216 is a deficient number, since it is larger than the sum of its proper divisors (1877281616).

2001211216 is a wasteful number, since it uses less digits than its factorization.

2001211216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36978 (or 36972 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 2001211216 is about 44734.8993069170. The cubic root of 2001211216 is about 1260.1753379912.

Adding to 2001211216 its reverse (6121121002), we get a palindrome (8122332218).

The spelling of 2001211216 in words is "two billion, one million, two hundred eleven thousand, two hundred sixteen".