21222001011111 has 8 divisors (see below), whose sum is σ = 28307708433264. Its totient is φ = 14142147131520.

The previous prime is 21222001011109. The next prime is 21222001011137. The reversal of 21222001011111 is 11111010022212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222001011111 - 2¹ = 21222001011109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222001011311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1463377180 + ... + 1463391681.

It is an arithmetic number, because the mean of its divisors is an integer number (3538463554158).

Almost surely, 2^{21222001011111} is an apocalyptic number.

21222001011111 is a deficient number, since it is larger than the sum of its proper divisors (7085707422153).

21222001011111 is a wasteful number, since it uses less digits than its factorization.

21222001011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926771281.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21222001011111 its reverse (11111010022212), we get a palindrome (32333011033323).

The spelling of 21222001011111 in words is "twenty-one trillion, two hundred twenty-two billion, one million, eleven thousand, one hundred eleven".