21504232401533 has 16 divisors (see below), whose sum is σ = 26226825375744. Its totient is φ = 17211354128640.

The previous prime is 21504232401527. The next prime is 21504232401539. The reversal of 21504232401533 is 33510423240512.

It is an interprime number because it is at equal distance from previous prime (21504232401527) and next prime (21504232401539).

It is not a de Polignac number, because 21504232401533 - 2²⁰ = 21504231352957 is a prime.

It is a super-2 number, since 2×21504232401533² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21504232401493 and 21504232401502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504232401539) 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, 711433058 + ... + 711463283.

It is an arithmetic number, because the mean of its divisors is an integer number (1639176585984).

Almost surely, 2^{21504232401533} is an apocalyptic number.

It is an amenable number.

21504232401533 is a deficient number, since it is larger than the sum of its proper divisors (4722592974211).

21504232401533 is a wasteful number, since it uses less digits than its factorization.

21504232401533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422896492.

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 21504232401533 in words is "twenty-one trillion, five hundred four billion, two hundred thirty-two million, four hundred one thousand, five hundred thirty-three".