221210404012123 has 16 divisors (see below), whose sum is σ = 231278895328320. Its totient is φ = 211179585741696.

The previous prime is 221210404012121. The next prime is 221210404012151. The reversal of 221210404012123 is 321210404012122.

It is a cyclic number.

It is not a de Polignac number, because 221210404012123 - 2¹ = 221210404012121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210404012121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80602333 + ... + 83301601.

It is an arithmetic number, because the mean of its divisors is an integer number (14454930958020).

Almost surely, 2^{221210404012123} is an apocalyptic number.

221210404012123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221210404012123 is a deficient number, since it is larger than the sum of its proper divisors (10068491316197).

221210404012123 is a wasteful number, since it uses less digits than its factorization.

221210404012123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706246.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 221210404012123 its reverse (321210404012122), we get a palindrome (542420808024245).

Subtracting 221210404012123 from its reverse (321210404012122), we obtain a palindrome (99999999999999).

The spelling of 221210404012123 in words is "two hundred twenty-one trillion, two hundred ten billion, four hundred four million, twelve thousand, one hundred twenty-three".