21221001201123 has 32 divisors (see below), whose sum is σ = 31779292043520. Its totient is φ = 13994139882240.

The previous prime is 21221001201053. The next prime is 21221001201167. The reversal of 21221001201123 is 32110210012212.

21221001201123 is a `hidden beast` number, since 212 + 210 + 0 + 120 + 1 + 123 = 666.

It is not a de Polignac number, because 21221001201123 - 2²² = 21220997006819 is a prime.

It is a super-2 number, since 2×21221001201123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221001201096 and 21221001201105.

It is not an unprimeable number, because it can be changed into a prime (21221001201223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2869968 + ... + 7118898.

It is an arithmetic number, because the mean of its divisors is an integer number (993102876360).

Almost surely, 2^{21221001201123} is an apocalyptic number.

21221001201123 is a deficient number, since it is larger than the sum of its proper divisors (10558290842397).

21221001201123 is a wasteful number, since it uses less digits than its factorization.

21221001201123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250944 (or 4250938 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21221001201123 its reverse (32110210012212), we get a palindrome (53331211213335).

The spelling of 21221001201123 in words is "twenty-one trillion, two hundred twenty-one billion, one million, two hundred one thousand, one hundred twenty-three".