2221531164 has 48 divisors (see below), whose sum is σ = 5763690240. Its totient is φ = 739974960.

The previous prime is 2221531163. The next prime is 2221531183. The reversal of 2221531164 is 4611351222.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221531163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159979 + ... + 173309.

It is an arithmetic number, because the mean of its divisors is an integer number (120076880).

Almost surely, 2^2221531164 is an apocalyptic number.

It is an amenable number.

2221531164 is an abundant number, since it is smaller than the sum of its proper divisors (3542159076).

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

2221531164 is a wasteful number, since it uses less digits than its factorization.

2221531164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14887 (or 14879 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2221531164 is about 47133.1217298409. The cubic root of 2221531164 is about 1304.8205962917.

Adding to 2221531164 its reverse (4611351222), we get a palindrome (6832882386).

The spelling of 2221531164 in words is "two billion, two hundred twenty-one million, five hundred thirty-one thousand, one hundred sixty-four".