21260242113 has 64 divisors (see below), whose sum is σ = 32450181120. Its totient is φ = 12263283200.

The previous prime is 21260242063. The next prime is 21260242117. The reversal of 21260242113 is 31124206212.

It is a cyclic number.

It is not a de Polignac number, because 21260242113 - 2¹⁶ = 21260176577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21260242117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21894718 + ... + 21895688.

It is an arithmetic number, because the mean of its divisors is an integer number (507034080).

Almost surely, 2^21260242113 is an apocalyptic number.

It is an amenable number.

21260242113 is a deficient number, since it is larger than the sum of its proper divisors (11189939007).

21260242113 is a wasteful number, since it uses less digits than its factorization.

21260242113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21260242113 its reverse (31124206212), we get a palindrome (52384448325).

The spelling of 21260242113 in words is "twenty-one billion, two hundred sixty million, two hundred forty-two thousand, one hundred thirteen".