221211003123 has 24 divisors (see below), whose sum is σ = 363730348800. Its totient is φ = 128238261360.

The previous prime is 221211003113. The next prime is 221211003137. The reversal of 221211003123 is 321300112122.

It is not a de Polignac number, because 221211003123 - 2⁶ = 221211003059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211003096 and 221211003105.

It is not an unprimeable number, because it can be changed into a prime (221211003103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48572823 + ... + 48577376.

It is an arithmetic number, because the mean of its divisors is an integer number (15155431200).

Almost surely, 2^221211003123 is an apocalyptic number.

221211003123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221211003123 is a deficient number, since it is larger than the sum of its proper divisors (142519345677).

221211003123 is a wasteful number, since it uses less digits than its factorization.

221211003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97150239 (or 97150236 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221211003123 its reverse (321300112122), we get a palindrome (542511115245).

The spelling of 221211003123 in words is "two hundred twenty-one billion, two hundred eleven million, three thousand, one hundred twenty-three".