21442505255140 has 48 divisors (see below), whose sum is σ = 47783445816960. Its totient is φ = 8065036601600.

The previous prime is 21442505255077. The next prime is 21442505255153. The reversal of 21442505255140 is 4155250524412.

It is a junction number, because it is equal to n+sod(n) for n = 21442505255093 and 21442505255102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395007961 + ... + 395062240.

It is an arithmetic number, because the mean of its divisors is an integer number (995488454520).

Almost surely, 2^{21442505255140} is an apocalyptic number.

21442505255140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21442505255140 is an abundant number, since it is smaller than the sum of its proper divisors (26340940561820).

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

21442505255140 is a wasteful number, since it uses less digits than its factorization.

21442505255140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790070292 (or 790070290 counting only the distinct ones).

The product of its (nonzero) digits is 320000, while the sum is 40.

Adding to 21442505255140 its reverse (4155250524412), we get a palindrome (25597755779552).

The spelling of 21442505255140 in words is "twenty-one trillion, four hundred forty-two billion, five hundred five million, two hundred fifty-five thousand, one hundred forty".