21221222222201 has 8 divisors (see below), whose sum is σ = 21248194258080. Its totient is φ = 21194253355968.

The previous prime is 21221222222159. The next prime is 21221222222203. The reversal of 21221222222201 is 10222222212212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221222222201 - 2¹⁴ = 21221222205817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21221222222203) 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, 12753350 + ... + 14320976.

It is an arithmetic number, because the mean of its divisors is an integer number (2656024282260).

Almost surely, 2^{21221222222201} is an apocalyptic number.

It is an amenable number.

21221222222201 is a deficient number, since it is larger than the sum of its proper divisors (26972035879).

21221222222201 is a wasteful number, since it uses less digits than its factorization.

21221222222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584823.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21221222222201 its reverse (10222222212212), we get a palindrome (31443444434413).

The spelling of 21221222222201 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred one".