220121002021121 has 8 divisors (see below), whose sum is σ = 222025692720744. Its totient is φ = 218224264101760.

The previous prime is 220121002021049. The next prime is 220121002021157. The reversal of 220121002021121 is 121120200121022.

It can be written as a sum of positive squares in 4 ways, for example, as 107305483274896 + 112815518746225 = 10358836^2 + 10621465^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 220121002021121 - 2¹⁴ = 220121002004737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220121002021121.

It is not an unprimeable number, because it can be changed into a prime (220121002021171) 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, 1988139470 + ... + 1988250183.

It is an arithmetic number, because the mean of its divisors is an integer number (27753211590093).

Almost surely, 2^{220121002021121} is an apocalyptic number.

It is an amenable number.

220121002021121 is a deficient number, since it is larger than the sum of its proper divisors (1904690699623).

220121002021121 is a wasteful number, since it uses less digits than its factorization.

220121002021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976390131.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 220121002021121 its reverse (121120200121022), we get a palindrome (341241202142143).

The spelling of 220121002021121 in words is "two hundred twenty trillion, one hundred twenty-one billion, two million, twenty-one thousand, one hundred twenty-one".