21221010010111 has 4 divisors (see below), whose sum is σ = 21222536385952. Its totient is φ = 21219483634272.

The previous prime is 21221010010073. The next prime is 21221010010139. The reversal of 21221010010111 is 11101001012212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21221010010111 - 2¹¹ = 21221010008063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221010010091 and 21221010010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221016010111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763167066 + ... + 763194871.

It is an arithmetic number, because the mean of its divisors is an integer number (5305634096488).

Almost surely, 2^{21221010010111} is an apocalyptic number.

21221010010111 is a deficient number, since it is larger than the sum of its proper divisors (1526375841).

21221010010111 is a wasteful number, since it uses less digits than its factorization.

21221010010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526375840.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21221010010111 its reverse (11101001012212), we get a palindrome (32322011022323).

The spelling of 21221010010111 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, ten thousand, one hundred eleven".