221011123123 has 16 divisors (see below), whose sum is σ = 263334779136. Its totient is φ = 181541374560.

The previous prime is 221011123057. The next prime is 221011123189. The reversal of 221011123123 is 321321110122.

It is an interprime number because it is at equal distance from previous prime (221011123057) and next prime (221011123189).

It is not a de Polignac number, because 221011123123 - 2²¹ = 221009025971 is a prime.

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 221011123123.

It is not an unprimeable number, because it can be changed into a prime (221011123523) 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, 6910993 + ... + 6942898.

It is an arithmetic number, because the mean of its divisors is an integer number (16458423696).

Almost surely, 2^221011123123 is an apocalyptic number.

221011123123 is a deficient number, since it is larger than the sum of its proper divisors (42323656013).

221011123123 is a wasteful number, since it uses less digits than its factorization.

221011123123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13853994.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221011123123 its reverse (321321110122), we get a palindrome (542332233245).

The spelling of 221011123123 in words is "two hundred twenty-one billion, eleven million, one hundred twenty-three thousand, one hundred twenty-three".