2221061164 has 72 divisors (see below), whose sum is σ = 4850526240. Its totient is φ = 870573312.

The previous prime is 2221061147. The next prime is 2221061173. The reversal of 2221061164 is 4611601222.

It is a happy number.

It is a super-2 number, since 2×2221061164² = 9866225388458069792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 289344 + ... + 296920.

It is an arithmetic number, because the mean of its divisors is an integer number (67368420).

Almost surely, 2^2221061164 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 2221061164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2425263120).

2221061164 is an abundant number, since it is smaller than the sum of its proper divisors (2629465076).

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

2221061164 is a wasteful number, since it uses less digits than its factorization.

2221061164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7655 (or 7634 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2221061164 is about 47128.1355879903. The cubic root of 2221061164 is about 1304.7285713340.

Adding to 2221061164 its reverse (4611601222), we get a palindrome (6832662386).

The spelling of 2221061164 in words is "two billion, two hundred twenty-one million, sixty-one thousand, one hundred sixty-four".