21201222110001 has 48 divisors (see below), whose sum is σ = 31183354327104. Its totient is φ = 12765887318016.

The previous prime is 21201222109957. The next prime is 21201222110009. The reversal of 21201222110001 is 10001122210212.

It is not a de Polignac number, because 21201222110001 - 2⁹ = 21201222109489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201222110009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3016926 + ... + 7176648.

It is an arithmetic number, because the mean of its divisors is an integer number (649653215148).

Almost surely, 2^{21201222110001} is an apocalyptic number.

It is an amenable number.

21201222110001 is a deficient number, since it is larger than the sum of its proper divisors (9982132217103).

21201222110001 is a wasteful number, since it uses less digits than its factorization.

21201222110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159890 (or 4159853 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201222110001 its reverse (10001122210212), we get a palindrome (31202344320213).

The spelling of 21201222110001 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, one hundred ten thousand, one".