21201111022201 has 16 divisors (see below), whose sum is σ = 24002951356800. Its totient is φ = 18549289158400.

The previous prime is 21201111022193. The next prime is 21201111022309. The reversal of 21201111022201 is 10222011110212.

It is not a de Polignac number, because 21201111022201 - 2³ = 21201111022193 is a prime.

It is a super-2 number, since 2×21201111022201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201111022901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106751536 + ... + 106949953.

It is an arithmetic number, because the mean of its divisors is an integer number (1500184459800).

Almost surely, 2^{21201111022201} is an apocalyptic number.

It is an amenable number.

21201111022201 is a deficient number, since it is larger than the sum of its proper divisors (2801840334599).

21201111022201 is a wasteful number, since it uses less digits than its factorization.

21201111022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213701840.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201111022201 its reverse (10222011110212), we get a palindrome (31423122132413).

The spelling of 21201111022201 in words is "twenty-one trillion, two hundred one billion, one hundred eleven million, twenty-two thousand, two hundred one".