20120221011111 has 16 divisors (see below), whose sum is σ = 28895212184160. Its totient is φ = 12379686572160.

The previous prime is 20120221011083. The next prime is 20120221011139. The reversal of 20120221011111 is 11111012202102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20120221011083) and next prime (20120221011139).

It is not a de Polignac number, because 20120221011111 - 2⁶ = 20120221011047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120221011511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41168460 + ... + 41654321.

It is an arithmetic number, because the mean of its divisors is an integer number (1805950761510).

Almost surely, 2^{20120221011111} is an apocalyptic number.

20120221011111 is a deficient number, since it is larger than the sum of its proper divisors (8774991173049).

20120221011111 is a wasteful number, since it uses less digits than its factorization.

20120221011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82829026.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20120221011111 its reverse (11111012202102), we get a palindrome (31231233213213).

The spelling of 20120221011111 in words is "twenty trillion, one hundred twenty billion, two hundred twenty-one million, eleven thousand, one hundred eleven".