21001120220201 has 32 divisors (see below), whose sum is σ = 25313421217536. Its totient is φ = 17187109632000.

The previous prime is 21001120220191. The next prime is 21001120220203. The reversal of 21001120220201 is 10202202110012.

It is not a de Polignac number, because 21001120220201 - 2¹⁸ = 21001119958057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21001120220203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232987421 + ... + 233077541.

It is an arithmetic number, because the mean of its divisors is an integer number (791044413048).

Almost surely, 2^{21001120220201} is an apocalyptic number.

It is an amenable number.

21001120220201 is a deficient number, since it is larger than the sum of its proper divisors (4312300997335).

21001120220201 is a wasteful number, since it uses less digits than its factorization.

21001120220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144353.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001120220201 its reverse (10202202110012), we get a palindrome (31203322330213).

The spelling of 21001120220201 in words is "twenty-one trillion, one billion, one hundred twenty million, two hundred twenty thousand, two hundred one".