21501441215245 has 8 divisors (see below), whose sum is σ = 25802465620320. Its totient is φ = 17200662197520.

The previous prime is 21501441215239. The next prime is 21501441215249. The reversal of 21501441215245 is 54251214410512.

It is a happy number.

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

It is not a de Polignac number, because 21501441215245 - 2⁹ = 21501441214733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21501441215249) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 61154011 + ... + 61504600.

It is an arithmetic number, because the mean of its divisors is an integer number (3225308202540).

Almost surely, 2^{21501441215245} is an apocalyptic number.

It is an amenable number.

21501441215245 is a deficient number, since it is larger than the sum of its proper divisors (4301024405075).

21501441215245 is a wasteful number, since it uses less digits than its factorization.

21501441215245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122693675.

The product of its (nonzero) digits is 64000, while the sum is 37.

Adding to 21501441215245 its reverse (54251214410512), we get a palindrome (75752655625757).

The spelling of 21501441215245 in words is "twenty-one trillion, five hundred one billion, four hundred forty-one million, two hundred fifteen thousand, two hundred forty-five".