21222010011111 has 128 divisors (see below), whose sum is σ = 37041791754240. Its totient is φ = 10505463091200.

The previous prime is 21222010011109. The next prime is 21222010011157. The reversal of 21222010011111 is 11111001022212.

It is a happy number.

It is not a de Polignac number, because 21222010011111 - 2¹ = 21222010011109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222010011311) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 87845161 + ... + 88086413.

It is an arithmetic number, because the mean of its divisors is an integer number (289388998080).

Almost surely, 2^{21222010011111} is an apocalyptic number.

21222010011111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21222010011111 is a deficient number, since it is larger than the sum of its proper divisors (15819781743129).

21222010011111 is a wasteful number, since it uses less digits than its factorization.

21222010011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241617.

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

Adding to 21222010011111 its reverse (11111001022212), we get a palindrome (32333011033323).

The spelling of 21222010011111 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, eleven thousand, one hundred eleven".