21551235301201 has 32 divisors (see below), whose sum is σ = 23317257600000. Its totient is φ = 19857594512448.

The previous prime is 21551235301163. The next prime is 21551235301237. The reversal of 21551235301201 is 10210353215512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21551235301201 - 2⁹ = 21551235300689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21551235301291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1444154926 + ... + 1444169848.

It is an arithmetic number, because the mean of its divisors is an integer number (728664300000).

Almost surely, 2^{21551235301201} is an apocalyptic number.

It is an amenable number.

21551235301201 is a deficient number, since it is larger than the sum of its proper divisors (1766022298799).

21551235301201 is a wasteful number, since it uses less digits than its factorization.

21551235301201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19813.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 21551235301201 its reverse (10210353215512), we get a palindrome (31761588516713).

The spelling of 21551235301201 in words is "twenty-one trillion, five hundred fifty-one billion, two hundred thirty-five million, three hundred one thousand, two hundred one".