21155142140533 has 16 divisors (see below), whose sum is σ = 21246346440000. Its totient is φ = 21064146187392.

The previous prime is 21155142140479. The next prime is 21155142140557. The reversal of 21155142140533 is 33504124155112.

It is a cyclic number.

It is not a de Polignac number, because 21155142140533 - 2²⁹ = 21154605269621 is a prime.

It is a super-2 number, since 2×21155142140533² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21155142140492 and 21155142140501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155142140333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237206618 + ... + 1237223716.

It is an arithmetic number, because the mean of its divisors is an integer number (1327896652500).

Almost surely, 2^{21155142140533} is an apocalyptic number.

It is an amenable number.

21155142140533 is a deficient number, since it is larger than the sum of its proper divisors (91204299467).

21155142140533 is a wasteful number, since it uses less digits than its factorization.

21155142140533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22884.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 21155142140533 its reverse (33504124155112), we get a palindrome (54659266295645).

The spelling of 21155142140533 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-two million, one hundred forty thousand, five hundred thirty-three".