21533500201001 has 8 divisors (see below), whose sum is σ = 21802080736800. Its totient is φ = 21265870393728.

The previous prime is 21533500200991. The next prime is 21533500201007. The reversal of 21533500201001 is 10010200533512.

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 a de Polignac number, because none of the positive numbers 2^k-21533500201001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21533500201007) 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, 237636551 + ... + 237727148.

It is an arithmetic number, because the mean of its divisors is an integer number (2725260092100).

Almost surely, 2^{21533500201001} is an apocalyptic number.

It is an amenable number.

21533500201001 is a deficient number, since it is larger than the sum of its proper divisors (268580535799).

21533500201001 is an equidigital number, since it uses as much as digits as its factorization.

21533500201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475364263.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21533500201001 its reverse (10010200533512), we get a palindrome (31543700734513).

The spelling of 21533500201001 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred million, two hundred one thousand, one".