221000323123 has 6 divisors (see below), whose sum is σ = 231026803364. Its totient is φ = 211391612916.

The previous prime is 221000323073. The next prime is 221000323129. The reversal of 221000323123 is 321323000122.

It is not a de Polignac number, because 221000323123 - 2²¹ = 220998225971 is a prime.

It is a super-2 number, since 2×221000323123² (a number of 23 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 221000323123.

It is not an unprimeable number, because it can be changed into a prime (221000323129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208884465 + ... + 208885522.

Almost surely, 2^221000323123 is an apocalyptic number.

221000323123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221000323123 is a deficient number, since it is larger than the sum of its proper divisors (10026480241).

221000323123 is an equidigital number, since it uses as much as digits as its factorization.

221000323123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417770033 (or 417770010 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 221000323123 its reverse (321323000122), we get a palindrome (542323323245).

The spelling of 221000323123 in words is "two hundred twenty-one billion, three hundred twenty-three thousand, one hundred twenty-three".