220212212100021 has 6 divisors (see below), whose sum is σ = 318084306366710. Its totient is φ = 146808141400008.

The previous prime is 220212212100019. The next prime is 220212212100071. The reversal of 220212212100021 is 120001212212022.

It is a happy number.

220212212100021 is a `hidden beast` number, since 220 + 212 + 2 + 1 + 210 + 0 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 219989380897521 + 222831202500 = 14832039^2 + 472050^2 .

It is not a de Polignac number, because 220212212100021 - 2¹ = 220212212100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220212212099967 and 220212212100003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220212212100011) 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 5 ways as a sum of consecutive naturals, for example, 12234011783326 + ... + 12234011783343.

Almost surely, 2^{220212212100021} is an apocalyptic number.

It is an amenable number.

220212212100021 is a deficient number, since it is larger than the sum of its proper divisors (97872094266689).

220212212100021 is a wasteful number, since it uses less digits than its factorization.

220212212100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24468023566675 (or 24468023566672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 220212212100021 its reverse (120001212212022), we get a palindrome (340213424312043).

The spelling of 220212212100021 in words is "two hundred twenty trillion, two hundred twelve billion, two hundred twelve million, one hundred thousand, twenty-one".