21021122220201 has 12 divisors (see below), whose sum is σ = 30374302715328. Its totient is φ = 14009254014744.

The previous prime is 21021122220193. The next prime is 21021122220229. The reversal of 21021122220201 is 10202222112012.

It is a happy number.

21021122220201 is a `hidden beast` number, since 2 + 10 + 211 + 22 + 220 + 201 = 666.

It is not a de Polignac number, because 21021122220201 - 2³ = 21021122220193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021122210201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 402261205 + ... + 402313458.

It is an arithmetic number, because the mean of its divisors is an integer number (2531191892944).

Almost surely, 2^{21021122220201} is an apocalyptic number.

It is an amenable number.

21021122220201 is a deficient number, since it is larger than the sum of its proper divisors (9353180495127).

21021122220201 is a wasteful number, since it uses less digits than its factorization.

21021122220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804577572 (or 804577569 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21021122220201 its reverse (10202222112012), we get a palindrome (31223344332213).

The spelling of 21021122220201 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, two hundred one".