2011012220221 has 4 divisors (see below), whose sum is σ = 2011221688444. Its totient is φ = 2010802752000.

The previous prime is 2011012220219. The next prime is 2011012220249. The reversal of 2011012220221 is 1220222101102.

It is a happy number.

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 1239225372025 + 771786848196 = 1113205^2 + 878514^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011012220221 - 2¹ = 2011012220219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011012220195 and 2011012220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011012220201) 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, 104719710 + ... + 104738911.

It is an arithmetic number, because the mean of its divisors is an integer number (502805422111).

Almost surely, 2^{2011012220221} is an apocalyptic number.

It is an amenable number.

2011012220221 is a deficient number, since it is larger than the sum of its proper divisors (209468223).

2011012220221 is an equidigital number, since it uses as much as digits as its factorization.

2011012220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209468222.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2011012220221 its reverse (1220222101102), we get a palindrome (3231234321323).

The spelling of 2011012220221 in words is "two trillion, eleven billion, twelve million, two hundred twenty thousand, two hundred twenty-one".