21550542142120 has 32 divisors (see below), whose sum is σ = 48489421384800. Its totient is φ = 8620092134208.

The previous prime is 21550542142057. The next prime is 21550542142127. The reversal of 21550542142120 is 2124124505512.

It is not an unprimeable number, because it can be changed into a prime (21550542142127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1073154 + ... + 6652273.

It is an arithmetic number, because the mean of its divisors is an integer number (1515294418275).

Almost surely, 2^{21550542142120} is an apocalyptic number.

21550542142120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21550542142120 is an abundant number, since it is smaller than the sum of its proper divisors (26938879242680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21550542142120 is a wasteful number, since it uses less digits than its factorization.

21550542142120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7795177 (or 7795173 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 21550542142120 its reverse (2124124505512), we get a palindrome (23674666647632).

The spelling of 21550542142120 in words is "twenty-one trillion, five hundred fifty billion, five hundred forty-two million, one hundred forty-two thousand, one hundred twenty".