21315010533 has 16 divisors (see below), whose sum is σ = 30096924480. Its totient is φ = 13371837696.

The previous prime is 21315010523. The next prime is 21315010699. The reversal of 21315010533 is 33501051312.

It is not a de Polignac number, because 21315010533 - 2¹³ = 21315002341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315010523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295263 + ... + 360291.

It is an arithmetic number, because the mean of its divisors is an integer number (1881057780).

Almost surely, 2^21315010533 is an apocalyptic number.

It is an amenable number.

21315010533 is a deficient number, since it is larger than the sum of its proper divisors (8781913947).

21315010533 is a wasteful number, since it uses less digits than its factorization.

21315010533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71476.

The product of its (nonzero) digits is 1350, while the sum is 24.

Adding to 21315010533 its reverse (33501051312), we get a palindrome (54816061845).

The spelling of 21315010533 in words is "twenty-one billion, three hundred fifteen million, ten thousand, five hundred thirty-three".