123611005221 has 16 divisors (see below), whose sum is σ = 180582980160. Its totient is φ = 74588613120.

The previous prime is 123611005157. The next prime is 123611005249. The reversal of 123611005221 is 122500116321.

It is a happy number.

It is not a de Polignac number, because 123611005221 - 2⁶ = 123611005157 is a prime.

It is a super-2 number, since 2×123611005221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123611005191 and 123611005200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123611005261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8171020 + ... + 8186133.

It is an arithmetic number, because the mean of its divisors is an integer number (11286436260).

Almost surely, 2^123611005221 is an apocalyptic number.

123611005221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123611005221 is a deficient number, since it is larger than the sum of its proper divisors (56971974939).

123611005221 is a wasteful number, since it uses less digits than its factorization.

123611005221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16357396.

The product of its (nonzero) digits is 720, while the sum is 24.

Subtracting from 123611005221 its reverse (122500116321), we obtain a square (1110888900 = 33330²).

It can be divided in two parts, 12361100 and 5221, that added together give a palindrome (12366321).

The spelling of 123611005221 in words is "one hundred twenty-three billion, six hundred eleven million, five thousand, two hundred twenty-one".