21220102111 has 8 divisors (see below), whose sum is σ = 23640432480. Its totient is φ = 18912345312.

The previous prime is 21220102097. The next prime is 21220102129. The reversal of 21220102111 is 11120102212.

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 21220102111 - 2¹³ = 21220093919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220102091 and 21220102100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220102171) 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, 28142995 + ... + 28143748.

It is an arithmetic number, because the mean of its divisors is an integer number (2955054060).

Almost surely, 2^21220102111 is an apocalyptic number.

21220102111 is a deficient number, since it is larger than the sum of its proper divisors (2420330369).

21220102111 is a wasteful number, since it uses less digits than its factorization.

21220102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56286785.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21220102111 its reverse (11120102212), we get a palindrome (32340204323).

The spelling of 21220102111 in words is "twenty-one billion, two hundred twenty million, one hundred two thousand, one hundred eleven".