21001100111201 has 8 divisors (see below), whose sum is σ = 24001285648704. Its totient is φ = 18000921668400.

The previous prime is 21001100111183. The next prime is 21001100111249. The reversal of 21001100111201 is 10211100110012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21001100111201 - 2³⁸ = 20726222204257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001100111701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8665526 + ... + 10820976.

It is an arithmetic number, because the mean of its divisors is an integer number (3000160706088).

Almost surely, 2^{21001100111201} is an apocalyptic number.

It is an amenable number.

21001100111201 is a deficient number, since it is larger than the sum of its proper divisors (3000185537503).

21001100111201 is a wasteful number, since it uses less digits than its factorization.

21001100111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547351.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21001100111201 its reverse (10211100110012), we get a palindrome (31212200221213).

The spelling of 21001100111201 in words is "twenty-one trillion, one billion, one hundred million, one hundred eleven thousand, two hundred one".