16221016625 has 32 divisors (see below), whose sum is σ = 22303022976. Its totient is φ = 11680200000.

The previous prime is 16221016573. The next prime is 16221016649. The reversal of 16221016625 is 52661012261.

It is not a de Polignac number, because 16221016625 - 2²⁶ = 16153907761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16221016591 and 16221016600.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80474 + ... + 197276.

It is an arithmetic number, because the mean of its divisors is an integer number (696969468).

Almost surely, 2^16221016625 is an apocalyptic number.

It is an amenable number.

16221016625 is a deficient number, since it is larger than the sum of its proper divisors (6082006351).

16221016625 is a wasteful number, since it uses less digits than its factorization.

16221016625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116930 (or 116920 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 16221016625 its reverse (52661012261), we get a palindrome (68882028886).

The spelling of 16221016625 in words is "sixteen billion, two hundred twenty-one million, sixteen thousand, six hundred twenty-five".