20110222011221 has 4 divisors (see below), whose sum is σ = 20114318618700. Its totient is φ = 20106125403744.

The previous prime is 20110222011203. The next prime is 20110222011241. The reversal of 20110222011221 is 12211022201102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15105542962225 + 5004679048996 = 3886585^2 + 2237114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110222011221 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 20110222011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110222011241) 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, 2048296376 + ... + 2048306193.

It is an arithmetic number, because the mean of its divisors is an integer number (5028579654675).

Almost surely, 2^{20110222011221} is an apocalyptic number.

It is an amenable number.

20110222011221 is a deficient number, since it is larger than the sum of its proper divisors (4096607479).

20110222011221 is an equidigital number, since it uses as much as digits as its factorization.

20110222011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096607478.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20110222011221 its reverse (12211022201102), we get a palindrome (32321244212323).

The spelling of 20110222011221 in words is "twenty trillion, one hundred ten billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".