21424800664144 has 10 divisors (see below), whose sum is σ = 41510551286810. Its totient is φ = 10712400332064.

The previous prime is 21424800664129. The next prime is 21424800664177. The reversal of 21424800664144 is 44146600842412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20496445290000 + 928355374144 = 4527300^2 + 963512^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21424800664094 and 21424800664103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669525020739 + ... + 669525020770.

It is an arithmetic number, because the mean of its divisors is an integer number (4151055128681).

Almost surely, 2^{21424800664144} is an apocalyptic number.

It is an amenable number.

21424800664144 is a deficient number, since it is larger than the sum of its proper divisors (20085750622666).

21424800664144 is a wasteful number, since it uses less digits than its factorization.

21424800664144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339050041517 (or 1339050041511 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 46.

The spelling of 21424800664144 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred million, six hundred sixty-four thousand, one hundred forty-four".