21001120102201 has 16 divisors (see below), whose sum is σ = 21278090928640. Its totient is φ = 20724430970880.

The previous prime is 21001120102181. The next prime is 21001120102253. The reversal of 21001120102201 is 10220102110012.

It is a cyclic number.

It is not a de Polignac number, because 21001120102201 - 2⁵ = 21001120102169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001120108201) 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, 1901064460 + ... + 1901075506.

It is an arithmetic number, because the mean of its divisors is an integer number (1329880683040).

Almost surely, 2^{21001120102201} is an apocalyptic number.

It is an amenable number.

21001120102201 is a deficient number, since it is larger than the sum of its proper divisors (276970826439).

21001120102201 is a wasteful number, since it uses less digits than its factorization.

21001120102201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21544.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001120102201 its reverse (10220102110012), we get a palindrome (31221222212213).

The spelling of 21001120102201 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred two thousand, two hundred one".