21444100220501 has 8 divisors (see below), whose sum is σ = 24508171063680. Its totient is φ = 18380186365968.

The previous prime is 21444100220449. The next prime is 21444100220537. The reversal of 21444100220501 is 10502200144412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21444100220501 - 2⁶ = 21444100220437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444100220551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38954306 + ... + 39500963.

It is an arithmetic number, because the mean of its divisors is an integer number (3063521382960).

Almost surely, 2^{21444100220501} is an apocalyptic number.

It is an amenable number.

21444100220501 is a deficient number, since it is larger than the sum of its proper divisors (3064070843179).

21444100220501 is an equidigital number, since it uses as much as digits as its factorization.

21444100220501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78494323.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 21444100220501 its reverse (10502200144412), we get a palindrome (31946300364913).

The spelling of 21444100220501 in words is "twenty-one trillion, four hundred forty-four billion, one hundred million, two hundred twenty thousand, five hundred one".