2155220224 has 36 divisors (see below), whose sum is σ = 4306444324. Its totient is φ = 1076502528.

The previous prime is 2155220201. The next prime is 2155220239. The reversal of 2155220224 is 4220225512.

It can be written as a sum of positive squares in 2 ways, for example, as 431309824 + 1723910400 = 20768^2 + 41520^2 .

It is a super-2 number, since 2×2155220224² = 9289948427877220352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282184 + ... + 289720.

Almost surely, 2^2155220224 is an apocalyptic number.

It is an amenable number.

2155220224 is a deficient number, since it is larger than the sum of its proper divisors (2151224100).

2155220224 is an equidigital number, since it uses as much as digits as its factorization.

2155220224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8670 (or 8656 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 2155220224 is about 46424.3494730944. The cubic root of 2155220224 is about 1291.7066176881.

Adding to 2155220224 its reverse (4220225512), we get a palindrome (6375445736).

The spelling of 2155220224 in words is "two billion, one hundred fifty-five million, two hundred twenty thousand, two hundred twenty-four".