21121010201111 has 8 divisors (see below), whose sum is σ = 21636423967200. Its totient is φ = 20605609157760.

The previous prime is 21121010201099. The next prime is 21121010201147. The reversal of 21121010201111 is 11110201012112.

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 21121010201111 - 2⁶ = 21121010201047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121010201911) 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, 223955 + ... + 6503243.

It is an arithmetic number, because the mean of its divisors is an integer number (2704552995900).

Almost surely, 2^{21121010201111} is an apocalyptic number.

21121010201111 is a deficient number, since it is larger than the sum of its proper divisors (515413766089).

21121010201111 is an equidigital number, since it uses as much as digits as its factorization.

21121010201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6361369.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21121010201111 its reverse (11110201012112), we get a palindrome (32231211213223).

The spelling of 21121010201111 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, two hundred one thousand, one hundred eleven".