220555220121001 has 4 divisors (see below), whose sum is σ = 220557341702992. Its totient is φ = 220553098539012.

The previous prime is 220555220120881. The next prime is 220555220121011. The reversal of 220555220121001 is 100121022555022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220555220121001 - 2³⁹ = 220005464307113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220555220121011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060635051 + ... + 1060842976.

It is an arithmetic number, because the mean of its divisors is an integer number (55139335425748).

Almost surely, 2^{220555220121001} is an apocalyptic number.

It is an amenable number.

220555220121001 is a deficient number, since it is larger than the sum of its proper divisors (2121581991).

220555220121001 is a wasteful number, since it uses less digits than its factorization.

220555220121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121581990.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 220555220121001 its reverse (100121022555022), we get a palindrome (320676242676023).

The spelling of 220555220121001 in words is "two hundred twenty trillion, five hundred fifty-five billion, two hundred twenty million, one hundred twenty-one thousand, one".