220121100111111 has 4 divisors (see below), whose sum is σ = 293494800148152. Its totient is φ = 146747400074072.

The previous prime is 220121100111089. The next prime is 220121100111127. The reversal of 220121100111111 is 111111001121022.

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 220121100111111 - 2³⁷ = 219983661157639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121100118111) 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, 36686850018516 + ... + 36686850018521.

It is an arithmetic number, because the mean of its divisors is an integer number (73373700037038).

Almost surely, 2^{220121100111111} is an apocalyptic number.

220121100111111 is a deficient number, since it is larger than the sum of its proper divisors (73373700037041).

220121100111111 is an equidigital number, since it uses as much as digits as its factorization.

220121100111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73373700037040.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 220121100111111 its reverse (111111001121022), we get a palindrome (331232101232133).

The spelling of 220121100111111 in words is "two hundred twenty trillion, one hundred twenty-one billion, one hundred million, one hundred eleven thousand, one hundred eleven".