21041420533 has 16 divisors (see below), whose sum is σ = 25110708480. Its totient is φ = 17239090176.

The previous prime is 21041420513. The next prime is 21041420563. The reversal of 21041420533 is 33502414012.

It is not a de Polignac number, because 21041420533 - 2²⁵ = 21007866101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21041420498 and 21041420507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041420513) 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, 184341 + ... + 275797.

It is an arithmetic number, because the mean of its divisors is an integer number (1569419280).

Almost surely, 2^21041420533 is an apocalyptic number.

21041420533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21041420533 is a deficient number, since it is larger than the sum of its proper divisors (4069287947).

21041420533 is a wasteful number, since it uses less digits than its factorization.

21041420533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92916.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21041420533 its reverse (33502414012), we get a palindrome (54543834545).

The spelling of 21041420533 in words is "twenty-one billion, forty-one million, four hundred twenty thousand, five hundred thirty-three".