123601271221 has 16 divisors (see below), whose sum is σ = 133381914624. Its totient is φ = 114100856064.

The previous prime is 123601271161. The next prime is 123601271249. The reversal of 123601271221 is 122172106321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123601271221 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 123601271221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123601271251) 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, 3209140 + ... + 3247426.

It is an arithmetic number, because the mean of its divisors is an integer number (8336369664).

Almost surely, 2^123601271221 is an apocalyptic number.

It is an amenable number.

123601271221 is a deficient number, since it is larger than the sum of its proper divisors (9780643403).

123601271221 is a wasteful number, since it uses less digits than its factorization.

123601271221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41940.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 123601271221 its reverse (122172106321), we get a palindrome (245773377542).

The spelling of 123601271221 in words is "one hundred twenty-three billion, six hundred one million, two hundred seventy-one thousand, two hundred twenty-one".