21550542543131 has 8 divisors (see below), whose sum is σ = 24634729896960. Its totient is φ = 18467739794088.

The previous prime is 21550542543121. The next prime is 21550542543149. The reversal of 21550542543131 is 13134524505512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21550542543131 - 2¹⁰ = 21550542542107 is a prime.

It is a super-2 number, since 2×21550542543131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21550542543121) 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 7 ways as a sum of consecutive naturals, for example, 346117841 + ... + 346180098.

It is an arithmetic number, because the mean of its divisors is an integer number (3079341237120).

Almost surely, 2^{21550542543131} is an apocalyptic number.

21550542543131 is a deficient number, since it is larger than the sum of its proper divisors (3084187353829).

21550542543131 is an equidigital number, since it uses as much as digits as its factorization.

21550542543131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692302393.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 21550542543131 in words is "twenty-one trillion, five hundred fifty billion, five hundred forty-two million, five hundred forty-three thousand, one hundred thirty-one".