21021222001201 has 8 divisors (see below), whose sum is σ = 21450955051008. Its totient is φ = 20594234850000.

The previous prime is 21021222001163. The next prime is 21021222001229. The reversal of 21021222001201 is 10210022212012.

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-21021222001201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021222001601) 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, 686459185 + ... + 686489806.

It is an arithmetic number, because the mean of its divisors is an integer number (2681369381376).

Almost surely, 2^{21021222001201} is an apocalyptic number.

It is an amenable number.

21021222001201 is a deficient number, since it is larger than the sum of its proper divisors (429733049807).

21021222001201 is a wasteful number, since it uses less digits than its factorization.

21021222001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372949303.

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

Adding to 21021222001201 its reverse (10210022212012), we get a palindrome (31231244213213).

The spelling of 21021222001201 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-two million, one thousand, two hundred one".