2145521216 has 14 divisors (see below), whose sum is σ = 4257518790. Its totient is φ = 1072760576.

The previous prime is 2145521153. The next prime is 2145521233. The reversal of 2145521216 is 6121255412.

It can be written as a sum of positive squares in only one way, i.e., 1574502400 + 571018816 = 39680^2 + 23896^2 .

It is a super-2 number, since 2×2145521216² = 9206522576612237312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16761821 + ... + 16761948.

It is an arithmetic number, because the mean of its divisors is an integer number (304108485).

Almost surely, 2^2145521216 is an apocalyptic number.

It is an amenable number.

2145521216 is a deficient number, since it is larger than the sum of its proper divisors (2111997574).

2145521216 is an equidigital number, since it uses as much as digits as its factorization.

2145521216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33523781 (or 33523771 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 2145521216 is about 46319.7713293147. The cubic root of 2145521216 is about 1289.7660405385.

Adding to 2145521216 its reverse (6121255412), we get a palindrome (8266776628).

The spelling of 2145521216 in words is "two billion, one hundred forty-five million, five hundred twenty-one thousand, two hundred sixteen".