21126461513 has 16 divisors (see below), whose sum is σ = 22395035520. Its totient is φ = 19874054016.

The previous prime is 21126461501. The next prime is 21126461563. The reversal of 21126461513 is 31516462112.

It is a cyclic number.

It is not a de Polignac number, because 21126461513 - 2⁶ = 21126461449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21126461513.

It is not an unprimeable number, because it can be changed into a prime (21126461563) 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 15 ways as a sum of consecutive naturals, for example, 1577381 + ... + 1590717.

It is an arithmetic number, because the mean of its divisors is an integer number (1399689720).

Almost surely, 2^21126461513 is an apocalyptic number.

It is an amenable number.

21126461513 is a deficient number, since it is larger than the sum of its proper divisors (1268574007).

21126461513 is a wasteful number, since it uses less digits than its factorization.

21126461513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13936.

The product of its digits is 8640, while the sum is 32.

The spelling of 21126461513 in words is "twenty-one billion, one hundred twenty-six million, four hundred sixty-one thousand, five hundred thirteen".