21242243452501 has 8 divisors (see below), whose sum is σ = 21440868070464. Its totient is φ = 21043620667680.

The previous prime is 21242243452433. The next prime is 21242243452543. The reversal of 21242243452501 is 10525434224212.

It is a happy number.

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 21242243452501 - 2¹³ = 21242243444309 is a prime.

It is a super-4 number, since 4×21242243452501⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242243452561) 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, 37298241 + ... + 37863481.

It is an arithmetic number, because the mean of its divisors is an integer number (2680108508808).

Almost surely, 2^{21242243452501} is an apocalyptic number.

It is an amenable number.

21242243452501 is a deficient number, since it is larger than the sum of its proper divisors (198624617963).

21242243452501 is a wasteful number, since it uses less digits than its factorization.

21242243452501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916571.

The product of its (nonzero) digits is 153600, while the sum is 37.

Adding to 21242243452501 its reverse (10525434224212), we get a palindrome (31767677676713).

The spelling of 21242243452501 in words is "twenty-one trillion, two hundred forty-two billion, two hundred forty-three million, four hundred fifty-two thousand, five hundred one".