21220010111 has 8 divisors (see below), whose sum is σ = 21266677824. Its totient is φ = 21173387040.

The previous prime is 21220010107. The next prime is 21220010137. The reversal of 21220010111 is 11101002212.

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

It is a cyclic number.

It is not a de Polignac number, because 21220010111 - 2² = 21220010107 is a prime.

It is a super-2 number, since 2×21220010111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220010092 and 21220010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220010171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1048490 + ... + 1068536.

It is an arithmetic number, because the mean of its divisors is an integer number (2658334728).

Almost surely, 2^21220010111 is an apocalyptic number.

21220010111 is a deficient number, since it is larger than the sum of its proper divisors (46667713).

21220010111 is a wasteful number, since it uses less digits than its factorization.

21220010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22321.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21220010111 its reverse (11101002212), we get a palindrome (32321012323).

The spelling of 21220010111 in words is "twenty-one billion, two hundred twenty million, ten thousand, one hundred eleven".