21442025515542 has 16 divisors (see below), whose sum is σ = 42904579563120. Its totient is φ = 7143920416512.

The previous prime is 21442025515523. The next prime is 21442025515601. The reversal of 21442025515542 is 24551552024412.

It is a junction number, because it is equal to n+sod(n) for n = 21442025515494 and 21442025515503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855341923 + ... + 855366990.

It is an arithmetic number, because the mean of its divisors is an integer number (2681536222695).

Almost surely, 2^{21442025515542} is an apocalyptic number.

21442025515542 is an abundant number, since it is smaller than the sum of its proper divisors (21462554047578).

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

21442025515542 is a wasteful number, since it uses less digits than its factorization.

21442025515542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710711007.

The product of its (nonzero) digits is 640000, while the sum is 42.

Adding to 21442025515542 its reverse (24551552024412), we get a palindrome (45993577539954).

The spelling of 21442025515542 in words is "twenty-one trillion, four hundred forty-two billion, twenty-five million, five hundred fifteen thousand, five hundred forty-two".