21544432222245 has 64 divisors (see below), whose sum is σ = 36649144604160. Its totient is φ = 10769946624000.

The previous prime is 21544432222217. The next prime is 21544432222283. The reversal of 21544432222245 is 54222223444512.

It is not a de Polignac number, because 21544432222245 - 2⁸ = 21544432221989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21544432222197 and 21544432222206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 174924285 + ... + 175047405.

It is an arithmetic number, because the mean of its divisors is an integer number (572642884440).

Almost surely, 2^{21544432222245} is an apocalyptic number.

It is an amenable number.

21544432222245 is a deficient number, since it is larger than the sum of its proper divisors (15104712381915).

21544432222245 is a wasteful number, since it uses less digits than its factorization.

21544432222245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125966.

The product of its digits is 1228800, while the sum is 42.

Adding to 21544432222245 its reverse (54222223444512), we get a palindrome (75766655666757).

The spelling of 21544432222245 in words is "twenty-one trillion, five hundred forty-four billion, four hundred thirty-two million, two hundred twenty-two thousand, two hundred forty-five".