21223111212123 has 8 divisors (see below), whose sum is σ = 28685118350928. Its totient is φ = 13954922440704.

The previous prime is 21223111212097. The next prime is 21223111212131. The reversal of 21223111212123 is 32121211132212.

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

It is not a de Polignac number, because 21223111212123 - 2⁹ = 21223111211611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223111212093 and 21223111212102.

It is not an unprimeable number, because it can be changed into a prime (21223111212923) 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, 48454591590 + ... + 48454592027.

It is an arithmetic number, because the mean of its divisors is an integer number (3585639793866).

Almost surely, 2^{21223111212123} is an apocalyptic number.

21223111212123 is a deficient number, since it is larger than the sum of its proper divisors (7462007138805).

21223111212123 is an equidigital number, since it uses as much as digits as its factorization.

21223111212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96909183693.

The product of its digits is 576, while the sum is 24.

Adding to 21223111212123 its reverse (32121211132212), we get a palindrome (53344322344335).

The spelling of 21223111212123 in words is "twenty-one trillion, two hundred twenty-three billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-three".