21111202201211 has 8 divisors (see below), whose sum is σ = 21211955115024. Its totient is φ = 21010455889920.

The previous prime is 21111202201147. The next prime is 21111202201237. The reversal of 21111202201211 is 11210220211112.

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 21111202201211 - 2⁶ = 21111202201147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111202201211.

It is not an unprimeable number, because it can be changed into a prime (21111202201511) 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, 4819895 + ... + 8090351.

It is an arithmetic number, because the mean of its divisors is an integer number (2651494389378).

Almost surely, 2^{21111202201211} is an apocalyptic number.

21111202201211 is a deficient number, since it is larger than the sum of its proper divisors (100752913813).

21111202201211 is a wasteful number, since it uses less digits than its factorization.

21111202201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301261.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111202201211 its reverse (11210220211112), we get a palindrome (32321422412323).

The spelling of 21111202201211 in words is "twenty-one trillion, one hundred eleven billion, two hundred two million, two hundred one thousand, two hundred eleven".