21123213144242 has 8 divisors (see below), whose sum is σ = 34565257872432. Its totient is φ = 9601460520100.

The previous prime is 21123213144233. The next prime is 21123213144311. The reversal of 21123213144242 is 24244131232112.

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 = 21123213144199 and 21123213144208.

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, 480073025984 + ... + 480073026027.

It is an arithmetic number, because the mean of its divisors is an integer number (4320657234054).

Almost surely, 2^{21123213144242} is an apocalyptic number.

21123213144242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21123213144242 is a deficient number, since it is larger than the sum of its proper divisors (13442044728190).

21123213144242 is a wasteful number, since it uses less digits than its factorization.

21123213144242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960146052024.

The product of its digits is 18432, while the sum is 32.

Adding to 21123213144242 its reverse (24244131232112), we get a palindrome (45367344376354).

The spelling of 21123213144242 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred thirteen million, one hundred forty-four thousand, two hundred forty-two".