220001021121 has 32 divisors (see below), whose sum is σ = 337262755840. Its totient is φ = 124958033856.

The previous prime is 220001021117. The next prime is 220001021209. The reversal of 220001021121 is 121120100022.

It is not a de Polignac number, because 220001021121 - 2² = 220001021117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220001021097 and 220001021106.

It is not an unprimeable number, because it can be changed into a prime (220001021111) 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 31 ways as a sum of consecutive naturals, for example, 2881380 + ... + 2956746.

It is an arithmetic number, because the mean of its divisors is an integer number (10539461120).

Almost surely, 2^220001021121 is an apocalyptic number.

220001021121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220001021121 is a deficient number, since it is larger than the sum of its proper divisors (117261734719).

220001021121 is a wasteful number, since it uses less digits than its factorization.

220001021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76213.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 220001021121 its reverse (121120100022), we get a palindrome (341121121143).

The spelling of 220001021121 in words is "two hundred twenty billion, one million, twenty-one thousand, one hundred twenty-one".