21113001321533 has 16 divisors (see below), whose sum is σ = 23138674944000. Its totient is φ = 19105068527280.

The previous prime is 21113001321499. The next prime is 21113001321569. The reversal of 21113001321533 is 33512310031112.

It is a cyclic number.

It is not a de Polignac number, because 21113001321533 - 2¹⁸ = 21113001059389 is a prime.

It is a super-3 number, since 3×21113001321533³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113001321233) 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, 18326678 + ... + 19444616.

It is an arithmetic number, because the mean of its divisors is an integer number (1446167184000).

Almost surely, 2^{21113001321533} is an apocalyptic number.

It is an amenable number.

21113001321533 is a deficient number, since it is larger than the sum of its proper divisors (2025673622467).

21113001321533 is a wasteful number, since it uses less digits than its factorization.

21113001321533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125872.

The product of its (nonzero) digits is 1620, while the sum is 26.

Adding to 21113001321533 its reverse (33512310031112), we get a palindrome (54625311352645).

The spelling of 21113001321533 in words is "twenty-one trillion, one hundred thirteen billion, one million, three hundred twenty-one thousand, five hundred thirty-three".