221212202212123 has 8 divisors (see below), whose sum is σ = 222571096636928. Its totient is φ = 219853329304104.

The previous prime is 221212202212063. The next prime is 221212202212151. The reversal of 221212202212123 is 321212202212122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221212202212123 - 2¹⁷ = 221212202081051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212202212163) 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, 15493786 + ... + 26124352.

It is an arithmetic number, because the mean of its divisors is an integer number (27821387079616).

Almost surely, 2^{221212202212123} is an apocalyptic number.

221212202212123 is a deficient number, since it is larger than the sum of its proper divisors (1358894424805).

221212202212123 is a wasteful number, since it uses less digits than its factorization.

221212202212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10758393.

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

Adding to 221212202212123 its reverse (321212202212122), we get a palindrome (542424404424245).

Subtracting 221212202212123 from its reverse (321212202212122), we obtain a palindrome (99999999999999).

The spelling of 221212202212123 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred two million, two hundred twelve thousand, one hundred twenty-three".