21533012313 has 16 divisors (see below), whose sum is σ = 28782550656. Its totient is φ = 14319446400.

The previous prime is 21533012287. The next prime is 21533012317. The reversal of 21533012313 is 31321033512.

It is not a de Polignac number, because 21533012313 - 2¹³ = 21533004121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21533012317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2925588 + ... + 2932938.

It is an arithmetic number, because the mean of its divisors is an integer number (1798909416).

Almost surely, 2^21533012313 is an apocalyptic number.

It is an amenable number.

21533012313 is a deficient number, since it is larger than the sum of its proper divisors (7249538343).

21533012313 is a wasteful number, since it uses less digits than its factorization.

21533012313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9664.

The product of its (nonzero) digits is 1620, while the sum is 24.

Adding to 21533012313 its reverse (31321033512), we get a palindrome (52854045825).

The spelling of 21533012313 in words is "twenty-one billion, five hundred thirty-three million, twelve thousand, three hundred thirteen".