221123020123 has 16 divisors (see below), whose sum is σ = 229713404544. Its totient is φ = 212700216960.

The previous prime is 221123020093. The next prime is 221123020169. The reversal of 221123020123 is 321020321122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221123020123 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 221123020123.

It is not an unprimeable number, because it can be changed into a prime (221123023123) 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, 3630961 + ... + 3691357.

It is an arithmetic number, because the mean of its divisors is an integer number (14357087784).

Almost surely, 2^221123020123 is an apocalyptic number.

221123020123 is a deficient number, since it is larger than the sum of its proper divisors (8590384421).

221123020123 is a wasteful number, since it uses less digits than its factorization.

221123020123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61782.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221123020123 its reverse (321020321122), we get a palindrome (542143341245).

The spelling of 221123020123 in words is "two hundred twenty-one billion, one hundred twenty-three million, twenty thousand, one hundred twenty-three".