2116621225 has 12 divisors (see below), whose sum is σ = 2636386816. Its totient is φ = 1685699280.

The previous prime is 2116621219. The next prime is 2116621259. The reversal of 2116621225 is 5221266112.

It is not a de Polignac number, because 2116621225 - 2²⁷ = 1982403497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2116621193 and 2116621202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184257 + ... + 195406.

Almost surely, 2^2116621225 is an apocalyptic number.

2116621225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2116621225 is a deficient number, since it is larger than the sum of its proper divisors (519765591).

2116621225 is a wasteful number, since it uses less digits than its factorization.

2116621225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379896 (or 379891 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 2116621225 is about 46006.7519501214. The cubic root of 2116621225 is about 1283.9488292108.

Adding to 2116621225 its reverse (5221266112), we get a palindrome (7337887337).

The spelling of 2116621225 in words is "two billion, one hundred sixteen million, six hundred twenty-one thousand, two hundred twenty-five".