21220012122001 has 16 divisors (see below), whose sum is σ = 26456235383808. Its totient is φ = 16535001646800.

The previous prime is 21220012121963. The next prime is 21220012122017. The reversal of 21220012122001 is 10022121002212.

It is a happy number.

It is not a de Polignac number, because 21220012122001 - 2²¹ = 21220010024849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220012122901) 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 15 ways as a sum of consecutive naturals, for example, 22887466 + ... + 23796556.

It is an arithmetic number, because the mean of its divisors is an integer number (1653514711488).

Almost surely, 2^{21220012122001} is an apocalyptic number.

It is an amenable number.

21220012122001 is a deficient number, since it is larger than the sum of its proper divisors (5236223261807).

21220012122001 is a wasteful number, since it uses less digits than its factorization.

21220012122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212252.

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

Adding to 21220012122001 its reverse (10022121002212), we get a palindrome (31242133124213).

The spelling of 21220012122001 in words is "twenty-one trillion, two hundred twenty billion, twelve million, one hundred twenty-two thousand, one".