21220222221111 has 16 divisors (see below), whose sum is σ = 28366471798784. Its totient is φ = 14110397684064.

The previous prime is 21220222221101. The next prime is 21220222221127. The reversal of 21220222221111 is 11112222202212.

It is not a de Polignac number, because 21220222221111 - 2¹⁸ = 21220221958967 is a prime.

It is a super-2 number, since 2×21220222221111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220222221101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21390066 + ... + 22360128.

It is an arithmetic number, because the mean of its divisors is an integer number (1772904487424).

Almost surely, 2^{21220222221111} is an apocalyptic number.

21220222221111 is a deficient number, since it is larger than the sum of its proper divisors (7146249577673).

21220222221111 is a wasteful number, since it uses less digits than its factorization.

21220222221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988830.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21220222221111 its reverse (11112222202212), we get a palindrome (32332444423323).

The spelling of 21220222221111 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".