220121011 has 4 divisors (see below), whose sum is σ = 240132024. Its totient is φ = 200110000.

The previous prime is 220120993. The next prime is 220121021. The reversal of 220121011 is 110121022.

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 220121011 - 2⁹ = 220120499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10005490 + ... + 10005511.

It is an arithmetic number, because the mean of its divisors is an integer number (60033006).

Almost surely, 2^220121011 is an apocalyptic number.

220121011 is a deficient number, since it is larger than the sum of its proper divisors (20011013).

220121011 is a wasteful number, since it uses less digits than its factorization.

220121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20011012.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 220121011 is about 14836.4756933714. The cubic root of 220121011 is about 603.7917383167.

Adding to 220121011 its reverse (110121022), we get a palindrome (330242033).

The spelling of 220121011 in words is "two hundred twenty million, one hundred twenty-one thousand, eleven".