2221164736 has 56 divisors (see below), whose sum is σ = 5075870976. Its totient is φ = 944636160.

The previous prime is 2221164727. The next prime is 2221164761. The reversal of 2221164736 is 6374611222.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39765 + ... + 77611.

Almost surely, 2^2221164736 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 2221164736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2537935488).

2221164736 is an abundant number, since it is smaller than the sum of its proper divisors (2854706240).

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

2221164736 is a wasteful number, since it uses less digits than its factorization.

2221164736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37997 (or 37987 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 2221164736 is about 47129.2344092284. The cubic root of 2221164736 is about 1304.7488516170.

Adding to 2221164736 its reverse (6374611222), we get a palindrome (8595775958).

The spelling of 2221164736 in words is "two billion, two hundred twenty-one million, one hundred sixty-four thousand, seven hundred thirty-six".