21542123452344 has 128 divisors (see below), whose sum is σ = 62766453657600. Its totient is φ = 6092037959040.

The previous prime is 21542123452301. The next prime is 21542123452351. The reversal of 21542123452344 is 44325432124512.

It is a junction number, because it is equal to n+sod(n) for n = 21542123452296 and 21542123452305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31713792 + ... + 32385935.

It is an arithmetic number, because the mean of its divisors is an integer number (490362919200).

Almost surely, 2^{21542123452344} is an apocalyptic number.

21542123452344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21542123452344 is an abundant number, since it is smaller than the sum of its proper divisors (41224330205256).

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

21542123452344 is a wasteful number, since it uses less digits than its factorization.

21542123452344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64099833 (or 64099829 counting only the distinct ones).

The product of its digits is 921600, while the sum is 42.

Adding to 21542123452344 its reverse (44325432124512), we get a palindrome (65867555576856).

The spelling of 21542123452344 in words is "twenty-one trillion, five hundred forty-two billion, one hundred twenty-three million, four hundred fifty-two thousand, three hundred forty-four".