21221120220001 has 8 divisors (see below), whose sum is σ = 23284712462760. Its totient is φ = 19219127745792.

The previous prime is 21221120219989. The next prime is 21221120220031. The reversal of 21221120220001 is 10002202112212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3594053848401 + 17627066371600 = 1895799^2 + 4198460^2 .

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

It is not a de Polignac number, because 21221120220001 - 2²¹ = 21221118122849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221120220031) 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 7 ways as a sum of consecutive naturals, for example, 15399941416 + ... + 15399942793.

It is an arithmetic number, because the mean of its divisors is an integer number (2910589057845).

Almost surely, 2^{21221120220001} is an apocalyptic number.

It is an amenable number.

21221120220001 is a deficient number, since it is larger than the sum of its proper divisors (2063592242759).

21221120220001 is a wasteful number, since it uses less digits than its factorization.

21221120220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30799884275.

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

Adding to 21221120220001 its reverse (10002202112212), we get a palindrome (31223322332213).

The spelling of 21221120220001 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, one".