21223605112521 has 8 divisors (see below), whose sum is σ = 32340731600064. Its totient is φ = 12127774350000.

The previous prime is 21223605112459. The next prime is 21223605112529. The reversal of 21223605112521 is 12521150632212.

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

It is not a de Polignac number, because 21223605112521 - 2⁷ = 21223605112393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223605112529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505323931230 + ... + 505323931271.

It is an arithmetic number, because the mean of its divisors is an integer number (4042591450008).

Almost surely, 2^{21223605112521} is an apocalyptic number.

21223605112521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21223605112521 is a deficient number, since it is larger than the sum of its proper divisors (11117126487543).

21223605112521 is a wasteful number, since it uses less digits than its factorization.

21223605112521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010647862511.

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 21223605112521 its reverse (12521150632212), we get a palindrome (33744755744733).

The spelling of 21223605112521 in words is "twenty-one trillion, two hundred twenty-three billion, six hundred five million, one hundred twelve thousand, five hundred twenty-one".