21020330455533 has 12 divisors (see below), whose sum is σ = 30538206482940. Its totient is φ = 13932550435776.

The previous prime is 21020330455529. The next prime is 21020330455559. The reversal of 21020330455533 is 33555403302012.

21020330455533 is a `hidden beast` number, since 2 + 10 + 20 + 3 + 30 + 45 + 553 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19440930000969 + 1579400454564 = 4409187^2 + 1256742^2 .

It is not a de Polignac number, because 21020330455533 - 2² = 21020330455529 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020330455573) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6750265128 + ... + 6750268241.

It is an arithmetic number, because the mean of its divisors is an integer number (2544850540245).

Almost surely, 2^{21020330455533} is an apocalyptic number.

It is an amenable number.

21020330455533 is a deficient number, since it is larger than the sum of its proper divisors (9517876027407).

21020330455533 is a wasteful number, since it uses less digits than its factorization.

21020330455533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13500533548 (or 13500533545 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 36.

Adding to 21020330455533 its reverse (33555403302012), we get a palindrome (54575733757545).

The spelling of 21020330455533 in words is "twenty-one trillion, twenty billion, three hundred thirty million, four hundred fifty-five thousand, five hundred thirty-three".