21220121002201 has 8 divisors (see below), whose sum is σ = 23197551148800. Its totient is φ = 19250745561840.

The previous prime is 21220121002189. The next prime is 21220121002217. The reversal of 21220121002201 is 10220012102212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220121002201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220121002001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2013671046 + ... + 2013681583.

It is an arithmetic number, because the mean of its divisors is an integer number (2899693893600).

Almost surely, 2^{21220121002201} is an apocalyptic number.

It is an amenable number.

21220121002201 is a deficient number, since it is larger than the sum of its proper divisors (1977430146599).

21220121002201 is a wasteful number, since it uses less digits than its factorization.

21220121002201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027353119.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220121002201 its reverse (10220012102212), we get a palindrome (31440133104413).

It can be divided in two parts, 2122012 and 1002201, that added together give a palindrome (3124213).

The spelling of 21220121002201 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two thousand, two hundred one".