21020222111 has 16 divisors (see below), whose sum is σ = 25043601408. Its totient is φ = 17263476000.

The previous prime is 21020222099. The next prime is 21020222161. The reversal of 21020222111 is 11122202012.

It is a cyclic number.

It is not a de Polignac number, because 21020222111 - 2¹⁴ = 21020205727 is a prime.

It is a super-3 number, since 3×21020222111³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020222161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457625 + ... + 501458.

It is an arithmetic number, because the mean of its divisors is an integer number (1565225088).

Almost surely, 2^21020222111 is an apocalyptic number.

21020222111 is a deficient number, since it is larger than the sum of its proper divisors (4023379297).

21020222111 is a wasteful number, since it uses less digits than its factorization.

21020222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959222.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020222111 its reverse (11122202012), we get a palindrome (32142424123).

The spelling of 21020222111 in words is "twenty-one billion, twenty million, two hundred twenty-two thousand, one hundred eleven".