21001112102201 has 48 divisors (see below), whose sum is σ = 26492238414720. Its totient is φ = 16173468917760.

The previous prime is 21001112102143. The next prime is 21001112102227. The reversal of 21001112102201 is 10220121110012.

It is not a de Polignac number, because 21001112102201 - 2⁶ = 21001112102137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001112102251) 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, 347043935 + ... + 347104443.

It is an arithmetic number, because the mean of its divisors is an integer number (551921633640).

Almost surely, 2^{21001112102201} is an apocalyptic number.

It is an amenable number.

21001112102201 is a deficient number, since it is larger than the sum of its proper divisors (5491126312519).

21001112102201 is a wasteful number, since it uses less digits than its factorization.

21001112102201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61106 (or 60993 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001112102201 its reverse (10220121110012), we get a palindrome (31221233212213).

The spelling of 21001112102201 in words is "twenty-one trillion, one billion, one hundred twelve million, one hundred two thousand, two hundred one".