21221001201122 has 16 divisors (see below), whose sum is σ = 32034703732152. Its totient is φ = 10542768537600.

The previous prime is 21221001201053. The next prime is 21221001201167. The reversal of 21221001201122 is 22110210012212.

It can be written as a sum of positive squares in 4 ways, for example, as 21218193155041 + 2808046081 = 4606321^2 + 52991^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21221001201122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23675528 + ... + 24555500.

Almost surely, 2^{21221001201122} is an apocalyptic number.

21221001201122 is a deficient number, since it is larger than the sum of its proper divisors (10813702531030).

21221001201122 is a wasteful number, since it uses less digits than its factorization.

21221001201122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956933.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221001201122 its reverse (22110210012212), we get a palindrome (43331211213334).

The spelling of 21221001201122 in words is "twenty-one trillion, two hundred twenty-one billion, one million, two hundred one thousand, one hundred twenty-two".