21450124310533 has 2 divisors, whose sum is σ = 21450124310534. Its totient is φ = 21450124310532.

The previous prime is 21450124310519. The next prime is 21450124310551. The reversal of 21450124310533 is 33501342105412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20038452403489 + 1411671907044 = 4476433^2 + 1188138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21450124310533 is a prime.

It is a super-2 number, since 2×21450124310533² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450124310933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725062155266 + 10725062155267.

It is an arithmetic number, because the mean of its divisors is an integer number (10725062155267).

Almost surely, 2^{21450124310533} is an apocalyptic number.

It is an amenable number.

21450124310533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450124310533 is an equidigital number, since it uses as much as digits as its factorization.

21450124310533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 21450124310533 its reverse (33501342105412), we get a palindrome (54951466415945).

The spelling of 21450124310533 in words is "twenty-one trillion, four hundred fifty billion, one hundred twenty-four million, three hundred ten thousand, five hundred thirty-three".