2166224621345 has 16 divisors (see below), whose sum is σ = 2600908265280. Its totient is φ = 1732020840000.

The previous prime is 2166224621303. The next prime is 2166224621371. The reversal of 2166224621345 is 5431264226612.

It is a happy number.

It is not a de Polignac number, because 2166224621345 - 2³⁸ = 1891346714401 is a prime.

It is a super-2 number, since 2×2166224621345² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2166224621296 and 2166224621305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76750646 + ... + 76778864.

It is an arithmetic number, because the mean of its divisors is an integer number (162556766580).

Almost surely, 2^{2166224621345} is an apocalyptic number.

It is an amenable number.

2166224621345 is a deficient number, since it is larger than the sum of its proper divisors (434683643935).

2166224621345 is a wasteful number, since it uses less digits than its factorization.

2166224621345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36176.

The product of its digits is 829440, while the sum is 44.

Adding to 2166224621345 its reverse (5431264226612), we get a palindrome (7597488847957).

The spelling of 2166224621345 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-four million, six hundred twenty-one thousand, three hundred forty-five".