2211853644 has 144 divisors (see below), whose sum is σ = 7507019520. Its totient is φ = 530305920.

The previous prime is 2211853643. The next prime is 2211853661. The reversal of 2211853644 is 4463581122.

It is a happy number.

2211853644 is a `hidden beast` number, since 2 + 2 + 1 + 1 + 8 + 5 + 3 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2211853599 and 2211853608.

It is not an unprimeable number, because it can be changed into a prime (2211853643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5347 + ... + 66725.

It is an arithmetic number, because the mean of its divisors is an integer number (52132080).

Almost surely, 2^2211853644 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 2211853644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3753509760).

2211853644 is an abundant number, since it is smaller than the sum of its proper divisors (5295165876).

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

2211853644 is a wasteful number, since it uses less digits than its factorization.

2211853644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61420 (or 61415 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 2211853644 is about 47030.3481169340. The cubic root of 2211853644 is about 1302.9231350337.

The spelling of 2211853644 in words is "two billion, two hundred eleven million, eight hundred fifty-three thousand, six hundred forty-four".