220101100012021 has 4 divisors (see below), whose sum is σ = 220101709664844. Its totient is φ = 220100490359200.

The previous prime is 220101100011997. The next prime is 220101100012033. The reversal of 220101100012021 is 120210001101022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67662222747025 + 152438877264996 = 8225705^2 + 12346614^2 .

It is a cyclic number.

It is not a de Polignac number, because 220101100012021 - 2³¹ = 220098952528373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220101100011992 and 220101100012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220101100012061) 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, 304284550 + ... + 305007031.

It is an arithmetic number, because the mean of its divisors is an integer number (55025427416211).

Almost surely, 2^{220101100012021} is an apocalyptic number.

It is an amenable number.

220101100012021 is a deficient number, since it is larger than the sum of its proper divisors (609652823).

220101100012021 is an equidigital number, since it uses as much as digits as its factorization.

220101100012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609652822.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 220101100012021 its reverse (120210001101022), we get a palindrome (340311101113043).

The spelling of 220101100012021 in words is "two hundred twenty trillion, one hundred one billion, one hundred million, twelve thousand, twenty-one".