1212221011123 has 4 divisors (see below), whose sum is σ = 1214538833848. Its totient is φ = 1209903188400.

The previous prime is 1212221011121. The next prime is 1212221011163. The reversal of 1212221011123 is 3211101222121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212221011123 - 2¹ = 1212221011121 is a prime.

It is a super-2 number, since 2×1212221011123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212221011123.

It is not an unprimeable number, because it can be changed into a prime (1212221011121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1158910578 + ... + 1158911623.

It is an arithmetic number, because the mean of its divisors is an integer number (303634708462).

Almost surely, 2^{1212221011123} is an apocalyptic number.

1212221011123 is a deficient number, since it is larger than the sum of its proper divisors (2317822725).

1212221011123 is an equidigital number, since it uses as much as digits as its factorization.

1212221011123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317822724.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1212221011123 its reverse (3211101222121), we get a palindrome (4423322233244).

The spelling of 1212221011123 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, eleven thousand, one hundred twenty-three".