16621302225 has 24 divisors (see below), whose sum is σ = 29978786592. Its totient is φ = 8058812800.

The previous prime is 16621302221. The next prime is 16621302251. The reversal of 16621302225 is 52220312661.

It is not a de Polignac number, because 16621302225 - 2² = 16621302221 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16621302192 and 16621302201.

It is not an unprimeable number, because it can be changed into a prime (16621302221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10072692 + ... + 10074341.

It is an arithmetic number, because the mean of its divisors is an integer number (1249116108).

Almost surely, 2^16621302225 is an apocalyptic number.

16621302225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16621302225 is a deficient number, since it is larger than the sum of its proper divisors (13357484367).

16621302225 is a wasteful number, since it uses less digits than its factorization.

16621302225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20147057 (or 20147052 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 16621302225 its reverse (52220312661), we get a palindrome (68841614886).

The spelling of 16621302225 in words is "sixteen billion, six hundred twenty-one million, three hundred two thousand, two hundred twenty-five".