21001221201122 has 64 divisors (see below), whose sum is σ = 34342263446400. Its totient is φ = 9594002880000.

The previous prime is 21001221201053. The next prime is 21001221201131. The reversal of 21001221201122 is 22110212210012.

It is a self number, because there is not a number n which added to its sum of digits gives 21001221201122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6362076872 + ... + 6362080172.

It is an arithmetic number, because the mean of its divisors is an integer number (536597866350).

Almost surely, 2^{21001221201122} is an apocalyptic number.

21001221201122 is a deficient number, since it is larger than the sum of its proper divisors (13341042245278).

21001221201122 is a wasteful number, since it uses less digits than its factorization.

21001221201122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8163.

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

Adding to 21001221201122 its reverse (22110212210012), we get a palindrome (43111433411134).

The spelling of 21001221201122 in words is "twenty-one trillion, one billion, two hundred twenty-one million, two hundred one thousand, one hundred twenty-two".