220121221011111 has 12 divisors (see below), whose sum is σ = 363374714050192. Its totient is φ = 125783554863456.

The previous prime is 220121221011077. The next prime is 220121221011121. The reversal of 220121221011111 is 111110122121022.

It is a happy number.

220121221011111 is a `hidden beast` number, since 220 + 1 + 212 + 210 + 1 + 11 + 11 = 666.

It is not a de Polignac number, because 220121221011111 - 2¹⁵ = 220121220978343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121221011121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1746993817486 + ... + 1746993817611.

Almost surely, 2^{220121221011111} is an apocalyptic number.

220121221011111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

220121221011111 is a deficient number, since it is larger than the sum of its proper divisors (143253493039081).

220121221011111 is a wasteful number, since it uses less digits than its factorization.

220121221011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493987635110 (or 3493987635107 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 220121221011111 its reverse (111110122121022), we get a palindrome (331231343132133).

The spelling of 220121221011111 in words is "two hundred twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, eleven thousand, one hundred eleven".