21224320042123 has 8 divisors (see below), whose sum is σ = 23153841350640. Its totient is φ = 19294805011680.

The previous prime is 21224320042091. The next prime is 21224320042147. The reversal of 21224320042123 is 32124002342212.

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

It is not a de Polignac number, because 21224320042123 - 2⁵ = 21224320042091 is a prime.

It is a super-2 number, since 2×21224320042123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21224320042091 and 21224320042100.

It is not an unprimeable number, because it can be changed into a prime (21224320042183) 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, 8077113 + ... + 10377301.

It is an arithmetic number, because the mean of its divisors is an integer number (2894230168830).

Almost surely, 2^{21224320042123} is an apocalyptic number.

21224320042123 is a deficient number, since it is larger than the sum of its proper divisors (1929521308517).

21224320042123 is a wasteful number, since it uses less digits than its factorization.

21224320042123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139037.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21224320042123 its reverse (32124002342212), we get a palindrome (53348322384335).

The spelling of 21224320042123 in words is "twenty-one trillion, two hundred twenty-four billion, three hundred twenty million, forty-two thousand, one hundred twenty-three".