21003354110533 has 2 divisors, whose sum is σ = 21003354110534. Its totient is φ = 21003354110532.

The previous prime is 21003354110503. The next prime is 21003354110699. The reversal of 21003354110533 is 33501145330012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14061172531329 + 6942181579204 = 3749823^2 + 2634802^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003354110533 - 2³³ = 20994764175941 is a prime.

It is a super-2 number, since 2×21003354110533² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003354110495 and 21003354110504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003354110503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501677055266 + 10501677055267.

It is an arithmetic number, because the mean of its divisors is an integer number (10501677055267).

Almost surely, 2^{21003354110533} is an apocalyptic number.

It is an amenable number.

21003354110533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003354110533 is an equidigital number, since it uses as much as digits as its factorization.

21003354110533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 31.

Adding to 21003354110533 its reverse (33501145330012), we get a palindrome (54504499440545).

The spelling of 21003354110533 in words is "twenty-one trillion, three billion, three hundred fifty-four million, one hundred ten thousand, five hundred thirty-three".