21220221000011 has 4 divisors (see below), whose sum is σ = 23149332000024. Its totient is φ = 19291110000000.

The previous prime is 21220221000007. The next prime is 21220221000029. The reversal of 21220221000011 is 11000012202212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21220221000011 - 2² = 21220221000007 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 21220221000011.

It is not an unprimeable number, because it can be changed into a prime (21220221000001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964555499990 + ... + 964555500011.

It is an arithmetic number, because the mean of its divisors is an integer number (5787333000006).

Almost surely, 2^{21220221000011} is an apocalyptic number.

21220221000011 is a deficient number, since it is larger than the sum of its proper divisors (1929111000013).

21220221000011 is a wasteful number, since it uses less digits than its factorization.

21220221000011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929111000012.

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

Adding to 21220221000011 its reverse (11000012202212), we get a palindrome (32220233202223).

The spelling of 21220221000011 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, eleven", and thus it is an aban number.