21221111122201 has 8 divisors (see below), whose sum is σ = 22427007775200. Its totient is φ = 20024114076000.

The previous prime is 21221111122147. The next prime is 21221111122223. The reversal of 21221111122201 is 10222111112212.

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 not a de Polignac number, because 21221111122201 - 2¹⁹ = 21221110597913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221111128201) 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, 2224896796 + ... + 2224906333.

It is an arithmetic number, because the mean of its divisors is an integer number (2803375971900).

Almost surely, 2^{21221111122201} is an apocalyptic number.

It is an amenable number.

21221111122201 is a deficient number, since it is larger than the sum of its proper divisors (1205896652999).

21221111122201 is a wasteful number, since it uses less digits than its factorization.

21221111122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449803399.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21221111122201 its reverse (10222111112212), we get a palindrome (31443222234413).

The spelling of 21221111122201 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twenty-two thousand, two hundred one".