21354626513 has 8 divisors (see below), whose sum is σ = 23522131776. Its totient is φ = 19224817200.

The previous prime is 21354626507. The next prime is 21354626521. The reversal of 21354626513 is 31562645312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21354626513 - 2¹⁰ = 21354625489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21354626593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9422798 + ... + 9425063.

It is an arithmetic number, because the mean of its divisors is an integer number (2940266472).

Almost surely, 2^21354626513 is an apocalyptic number.

It is an amenable number.

21354626513 is a deficient number, since it is larger than the sum of its proper divisors (2167505263).

21354626513 is a wasteful number, since it uses less digits than its factorization.

21354626513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18847975.

The product of its digits is 129600, while the sum is 38.

The spelling of 21354626513 in words is "twenty-one billion, three hundred fifty-four million, six hundred twenty-six thousand, five hundred thirteen".