220121211221121 has 8 divisors (see below), whose sum is σ = 335422798051264. Its totient is φ = 125783549269200.

The previous prime is 220121211221113. The next prime is 220121211221143. The reversal of 220121211221121 is 121122112121022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220121211221121 - 2³ = 220121211221113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10481962439101 = 220121211221121 / (2 + 2 + 0 + 1 + 2 + 1 + 2 + 1 + 1 + 2 + 2 + 1 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (220121211221111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5240981219530 + ... + 5240981219571.

It is an arithmetic number, because the mean of its divisors is an integer number (41927849756408).

Almost surely, 2^{220121211221121} is an apocalyptic number.

220121211221121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220121211221121 is a deficient number, since it is larger than the sum of its proper divisors (115301586830143).

220121211221121 is a wasteful number, since it uses less digits than its factorization.

220121211221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10481962439111.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 220121211221121 its reverse (121122112121022), we get a palindrome (341243323342143).

The spelling of 220121211221121 in words is "two hundred twenty trillion, one hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".