21243524501 has 8 divisors (see below), whose sum is σ = 22104866304. Its totient is φ = 20399239120.

The previous prime is 21243524459. The next prime is 21243524509. The reversal of 21243524501 is 10542534212.

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

It is a cyclic number.

It is not a de Polignac number, because 21243524501 - 2⁶ = 21243524437 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 (21243524509) 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, 4261565 + ... + 4266546.

It is an arithmetic number, because the mean of its divisors is an integer number (2763108288).

Almost surely, 2^21243524501 is an apocalyptic number.

It is an amenable number.

21243524501 is a deficient number, since it is larger than the sum of its proper divisors (861341803).

21243524501 is an equidigital number, since it uses as much as digits as its factorization.

21243524501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8528211.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 21243524501 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, five hundred one".