21144415235442 has 8 divisors (see below), whose sum is σ = 42288830470896. Its totient is φ = 7048138411812.

The previous prime is 21144415235407. The next prime is 21144415235521. The reversal of 21144415235442 is 24453251444112.

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

21144415235442 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21144415235394 and 21144415235403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1762034602948 + ... + 1762034602959.

It is an arithmetic number, because the mean of its divisors is an integer number (5286103808862).

Almost surely, 2^{21144415235442} is an apocalyptic number.

21144415235442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21144415235442 is a wasteful number, since it uses less digits than its factorization.

21144415235442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524069205912.

The product of its digits is 614400, while the sum is 42.

Adding to 21144415235442 its reverse (24453251444112), we get a palindrome (45597666679554).

The spelling of 21144415235442 in words is "twenty-one trillion, one hundred forty-four billion, four hundred fifteen million, two hundred thirty-five thousand, four hundred forty-two".