21223221201 has 48 divisors (see below), whose sum is σ = 38749960704. Its totient is φ = 10892092032.

The previous prime is 21223221197. The next prime is 21223221211. The reversal of 21223221201 is 10212232212.

21223221201 is a `hidden beast` number, since 21 + 223 + 221 + 201 = 666.

It is not a de Polignac number, because 21223221201 - 2² = 21223221197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223221211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 319881 + ... + 380486.

It is an arithmetic number, because the mean of its divisors is an integer number (807290848).

Almost surely, 2^21223221201 is an apocalyptic number.

21223221201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21223221201 is a deficient number, since it is larger than the sum of its proper divisors (17526739503).

21223221201 is a wasteful number, since it uses less digits than its factorization.

21223221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700430 (or 700427 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21223221201 its reverse (10212232212), we get a palindrome (31435453413).

The spelling of 21223221201 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty-one thousand, two hundred one".