21622445616225 has 24 divisors (see below), whose sum is σ = 35762210134560. Its totient is φ = 11527745173120.

The previous prime is 21622445616221. The next prime is 21622445616281. The reversal of 21622445616225 is 52261654422612.

It is not a de Polignac number, because 21622445616225 - 2² = 21622445616221 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21622445616221) 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, 52616739 + ... + 53026088.

It is an arithmetic number, because the mean of its divisors is an integer number (1490092088940).

Almost surely, 2^{21622445616225} is an apocalyptic number.

21622445616225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21622445616225 is a deficient number, since it is larger than the sum of its proper divisors (14139764518335).

21622445616225 is a wasteful number, since it uses less digits than its factorization.

21622445616225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105645569 (or 105645564 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 48.

The spelling of 21622445616225 in words is "twenty-one trillion, six hundred twenty-two billion, four hundred forty-five million, six hundred sixteen thousand, two hundred twenty-five".