21111200211201 has 4 divisors (see below), whose sum is σ = 28148266948272. Its totient is φ = 14074133474132.

The previous prime is 21111200211187. The next prime is 21111200211203. The reversal of 21111200211201 is 10211200211112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21111200211201 - 2¹⁵ = 21111200178433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111200211203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518533368531 + ... + 3518533368536.

It is an arithmetic number, because the mean of its divisors is an integer number (7037066737068).

Almost surely, 2^{21111200211201} is an apocalyptic number.

It is an amenable number.

21111200211201 is a deficient number, since it is larger than the sum of its proper divisors (7037066737071).

21111200211201 is an equidigital number, since it uses as much as digits as its factorization.

21111200211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037066737070.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111200211201 its reverse (10211200211112), we get a palindrome (31322400422313).

The spelling of 21111200211201 in words is "twenty-one trillion, one hundred eleven billion, two hundred million, two hundred eleven thousand, two hundred one".