2101021216 has 144 divisors (see below), whose sum is σ = 5119329600. Its totient is φ = 843913728.

The previous prime is 2101021193. The next prime is 2101021217. The reversal of 2101021216 is 6121201012.

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 2101021216.

It is not an unprimeable number, because it can be changed into a prime (2101021217) 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, 3247005 + ... + 3247651.

It is an arithmetic number, because the mean of its divisors is an integer number (35550900).

Almost surely, 2^2101021216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101021216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2559664800).

2101021216 is an abundant number, since it is smaller than the sum of its proper divisors (3018308384).

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

2101021216 is a wasteful number, since it uses less digits than its factorization.

2101021216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799 (or 784 counting only the distinct ones).

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

The square root of 2101021216 is about 45836.8979753211. The cubic root of 2101021216 is about 1280.7867103854.

Adding to 2101021216 its reverse (6121201012), we get a palindrome (8222222228).

The spelling of 2101021216 in words is "two billion, one hundred one million, twenty-one thousand, two hundred sixteen".