21260072241 has 32 divisors (see below), whose sum is σ = 32951992320. Its totient is φ = 13521598992.

The previous prime is 21260072219. The next prime is 21260072257. The reversal of 21260072241 is 14227006212.

21260072241 is a `hidden beast` number, since 2 + 12 + 600 + 7 + 2 + 2 + 41 = 666.

It is not a de Polignac number, because 21260072241 - 2⁵ = 21260072209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21260072741) 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 31 ways as a sum of consecutive naturals, for example, 193150 + ... + 282536.

It is an arithmetic number, because the mean of its divisors is an integer number (1029749760).

Almost surely, 2^21260072241 is an apocalyptic number.

It is an amenable number.

21260072241 is a deficient number, since it is larger than the sum of its proper divisors (11691920079).

21260072241 is a wasteful number, since it uses less digits than its factorization.

21260072241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89802 (or 89796 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

Adding to 21260072241 its reverse (14227006212), we get a palindrome (35487078453).

The spelling of 21260072241 in words is "twenty-one billion, two hundred sixty million, seventy-two thousand, two hundred forty-one".