21113015533 has 8 divisors (see below), whose sum is σ = 21211885152. Its totient is φ = 21014197776.

The previous prime is 21113015509. The next prime is 21113015563. The reversal of 21113015533 is 33551031112.

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 21113015533 - 2⁵ = 21113015501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113015498 and 21113015507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113015563) 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, 978366 + ... + 999712.

It is an arithmetic number, because the mean of its divisors is an integer number (2651485644).

Almost surely, 2^21113015533 is an apocalyptic number.

It is an amenable number.

21113015533 is a deficient number, since it is larger than the sum of its proper divisors (98869619).

21113015533 is a wasteful number, since it uses less digits than its factorization.

21113015533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25931.

The product of its (nonzero) digits is 1350, while the sum is 25.

Adding to 21113015533 its reverse (33551031112), we get a palindrome (54664046645).

The spelling of 21113015533 in words is "twenty-one billion, one hundred thirteen million, fifteen thousand, five hundred thirty-three".