21220101212111 has 8 divisors (see below), whose sum is σ = 21241018641744. Its totient is φ = 21199186532160.

The previous prime is 21220101212081. The next prime is 21220101212173. The reversal of 21220101212111 is 11121210102212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220101212111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220101212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220101212911) 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, 14929400 + ... + 16288866.

It is an arithmetic number, because the mean of its divisors is an integer number (2655127330218).

Almost surely, 2^{21220101212111} is an apocalyptic number.

21220101212111 is a deficient number, since it is larger than the sum of its proper divisors (20917429633).

21220101212111 is a wasteful number, since it uses less digits than its factorization.

21220101212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374841.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21220101212111 its reverse (11121210102212), we get a palindrome (32341311314323).

The spelling of 21220101212111 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twelve thousand, one hundred eleven".