21211020221111 has 8 divisors (see below), whose sum is σ = 24241651200000. Its totient is φ = 18180510550488.

The previous prime is 21211020221087. The next prime is 21211020221117. The reversal of 21211020221111 is 11112202011212.

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 21211020221111 - 2²² = 21211016026807 is a prime.

It is a super-4 number, since 4×21211020221111⁴ (a number of 54 digits) contains 4444 as substring.

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 21211020221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211020221117) 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, 29952071 + ... + 30652056.

It is an arithmetic number, because the mean of its divisors is an integer number (3030206400000).

Almost surely, 2^{21211020221111} is an apocalyptic number.

21211020221111 is a deficient number, since it is larger than the sum of its proper divisors (3030630978889).

21211020221111 is an equidigital number, since it uses as much as digits as its factorization.

21211020221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60654133.

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

Adding to 21211020221111 its reverse (11112202011212), we get a palindrome (32323222232323).

The spelling of 21211020221111 in words is "twenty-one trillion, two hundred eleven billion, twenty million, two hundred twenty-one thousand, one hundred eleven".