21221011010111 has 8 divisors (see below), whose sum is σ = 23150228110464. Its totient is φ = 19291799623320.

The previous prime is 21221011010039. The next prime is 21221011010167. The reversal of 21221011010111 is 11101011012212.

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 21221011010111 - 2²⁶ = 21220943901247 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 (21221011010611) 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, 11164886 + ... + 12926588.

It is an arithmetic number, because the mean of its divisors is an integer number (2893778513808).

Almost surely, 2^{21221011010111} is an apocalyptic number.

21221011010111 is a deficient number, since it is larger than the sum of its proper divisors (1929217100353).

21221011010111 is a wasteful number, since it uses less digits than its factorization.

21221011010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856781.

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

Adding to 21221011010111 its reverse (11101011012212), we get a palindrome (32322022022323).

The spelling of 21221011010111 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, ten thousand, one hundred eleven".