220101220000021 has 4 divisors (see below), whose sum is σ = 220104975988044. Its totient is φ = 220097464012000.

The previous prime is 220101220000003. The next prime is 220101220000117. The reversal of 220101220000021 is 120000022101022.

It is a happy number.

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 52496763066225 + 167604456933796 = 7245465^2 + 12946214^2 .

It is a cyclic number.

It is not a de Polignac number, because 220101220000021 - 2¹¹ = 220101219997973 is a prime.

It is a super-3 number, since 3×220101220000021³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220101219999956 and 220101220000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220101220000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1877906110 + ... + 1878023311.

It is an arithmetic number, because the mean of its divisors is an integer number (55026243997011).

Almost surely, 2^{220101220000021} is an apocalyptic number.

It is an amenable number.

220101220000021 is a deficient number, since it is larger than the sum of its proper divisors (3755988023).

220101220000021 is an equidigital number, since it uses as much as digits as its factorization.

220101220000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755988022.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220101220000021 its reverse (120000022101022), we get a palindrome (340101242101043).

The spelling of 220101220000021 in words is "two hundred twenty trillion, one hundred one billion, two hundred twenty million, twenty-one", and thus it is an aban number.