221022012123 has 48 divisors (see below), whose sum is σ = 373413559680. Its totient is φ = 128128611600.

The previous prime is 221022012089. The next prime is 221022012173. The reversal of 221022012123 is 321210220122.

It is not a de Polignac number, because 221022012123 - 2²⁵ = 220988457691 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221022012096 and 221022012105.

It is not an unprimeable number, because it can be changed into a prime (221022012173) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 546273 + ... + 860498.

It is an arithmetic number, because the mean of its divisors is an integer number (7779449160).

Almost surely, 2^221022012123 is an apocalyptic number.

221022012123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221022012123 is a deficient number, since it is larger than the sum of its proper divisors (152391547557).

221022012123 is a wasteful number, since it uses less digits than its factorization.

221022012123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406837 (or 1406808 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 221022012123 its reverse (321210220122), we get a palindrome (542232232245).

The spelling of 221022012123 in words is "two hundred twenty-one billion, twenty-two million, twelve thousand, one hundred twenty-three".