220220011122121 has 4 divisors (see below), whose sum is σ = 220220040956692. Its totient is φ = 220219981287552.

The previous prime is 220220011122103. The next prime is 220220011122161. The reversal of 220220011122121 is 121221110022022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 159902094657600 + 60317916464521 = 12645240^2 + 7766461^2 .

It is a cyclic number.

It is not a de Polignac number, because 220220011122121 - 2²³ = 220220002733513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220220011122161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5181121 + ... + 21616753.

It is an arithmetic number, because the mean of its divisors is an integer number (55055010239173).

Almost surely, 2^{220220011122121} is an apocalyptic number.

It is an amenable number.

220220011122121 is a deficient number, since it is larger than the sum of its proper divisors (29834571).

220220011122121 is a wasteful number, since it uses less digits than its factorization.

220220011122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29834570.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 220220011122121 its reverse (121221110022022), we get a palindrome (341441121144143).

The spelling of 220220011122121 in words is "two hundred twenty trillion, two hundred twenty billion, eleven million, one hundred twenty-two thousand, one hundred twenty-one".