21212221021201 has 8 divisors (see below), whose sum is σ = 24257438469440. Its totient is φ = 18170728612848.

The previous prime is 21212221021141. The next prime is 21212221021219. The reversal of 21212221021201 is 10212012221212.

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

It is not a de Polignac number, because 21212221021201 - 2⁷ = 21212221021073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212221031201) 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, 931247766 + ... + 931270543.

It is an arithmetic number, because the mean of its divisors is an integer number (3032179808680).

Almost surely, 2^{21212221021201} is an apocalyptic number.

It is an amenable number.

21212221021201 is a deficient number, since it is larger than the sum of its proper divisors (3045217448239).

21212221021201 is a wasteful number, since it uses less digits than its factorization.

21212221021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862519943.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212221021201 its reverse (10212012221212), we get a palindrome (31424233242413).

The spelling of 21212221021201 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, twenty-one thousand, two hundred one".