21151123450533 has 12 divisors (see below), whose sum is σ = 30553106622220. Its totient is φ = 14100064108416.

The previous prime is 21151123450451. The next prime is 21151123450553. The reversal of 21151123450533 is 33505432115112.

It is a happy number.

21151123450533 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 112 + 3 + 4 + 5 + 0 + 533 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17274721626369 + 3876401824164 = 4156287^2 + 1968858^2 .

It is not a de Polignac number, because 21151123450533 - 2¹⁰ = 21151123449509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151123450553) 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, 56875918 + ... + 57246591.

Almost surely, 2^{21151123450533} is an apocalyptic number.

It is an amenable number.

21151123450533 is a deficient number, since it is larger than the sum of its proper divisors (9401983171687).

21151123450533 is a wasteful number, since it uses less digits than its factorization.

21151123450533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114143108 (or 114143105 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 21151123450533 its reverse (33505432115112), we get a palindrome (54656555565645).

The spelling of 21151123450533 in words is "twenty-one trillion, one hundred fifty-one billion, one hundred twenty-three million, four hundred fifty thousand, five hundred thirty-three".