21444100053524 has 6 divisors (see below), whose sum is σ = 37527175093674. Its totient is φ = 10722050026760.

The previous prime is 21444100053491. The next prime is 21444100053539. The reversal of 21444100053524 is 42535000144412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20919463488400 + 524636565124 = 4573780^2 + 724318^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680512506687 + ... + 2680512506694.

It is an arithmetic number, because the mean of its divisors is an integer number (6254529182279).

Almost surely, 2^{21444100053524} is an apocalyptic number.

It is an amenable number.

21444100053524 is a deficient number, since it is larger than the sum of its proper divisors (16083075040150).

21444100053524 is a wasteful number, since it uses less digits than its factorization.

21444100053524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361025013385 (or 5361025013383 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 21444100053524 its reverse (42535000144412), we get a palindrome (63979100197936).

The spelling of 21444100053524 in words is "twenty-one trillion, four hundred forty-four billion, one hundred million, fifty-three thousand, five hundred twenty-four".