21004144242442 has 8 divisors (see below), whose sum is σ = 33164438277600. Its totient is φ = 9949331483244.

The previous prime is 21004144242437. The next prime is 21004144242443. The reversal of 21004144242442 is 24424244140012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21004144242398 and 21004144242407.

It is not an unprimeable number, because it can be changed into a prime (21004144242443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276370318942 + ... + 276370319017.

It is an arithmetic number, because the mean of its divisors is an integer number (4145554784700).

Almost surely, 2^{21004144242442} is an apocalyptic number.

21004144242442 is a deficient number, since it is larger than the sum of its proper divisors (12160294035158).

21004144242442 is a wasteful number, since it uses less digits than its factorization.

21004144242442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552740637980.

The product of its (nonzero) digits is 65536, while the sum is 34.

Adding to 21004144242442 its reverse (24424244140012), we get a palindrome (45428388382454).

The spelling of 21004144242442 in words is "twenty-one trillion, four billion, one hundred forty-four million, two hundred forty-two thousand, four hundred forty-two".