21220012211111 has 8 divisors (see below), whose sum is σ = 24767430666240. Its totient is φ = 17801590790808.

The previous prime is 21220012211093. The next prime is 21220012211129. The reversal of 21220012211111 is 11111221002212.

It is an interprime number because it is at equal distance from previous prime (21220012211093) and next prime (21220012211129).

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 21220012211111 - 2³⁴ = 21202832341927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220012211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220062211111) 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, 32249258351 + ... + 32249259008.

It is an arithmetic number, because the mean of its divisors is an integer number (3095928833280).

Almost surely, 2^{21220012211111} is an apocalyptic number.

21220012211111 is a deficient number, since it is larger than the sum of its proper divisors (3547418455129).

21220012211111 is an equidigital number, since it uses as much as digits as its factorization.

21220012211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64498517413.

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

Adding to 21220012211111 its reverse (11111221002212), we get a palindrome (32331233213323).

The spelling of 21220012211111 in words is "twenty-one trillion, two hundred twenty billion, twelve million, two hundred eleven thousand, one hundred eleven".