220120212002021 has 4 divisors (see below), whose sum is σ = 220610457463500. Its totient is φ = 219629966540544.

The previous prime is 220120212002017. The next prime is 220120212002057. The reversal of 220120212002021 is 120200212021022.

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 86373045564100 + 133747166437921 = 9293710^2 + 11564911^2 .

It is a cyclic number.

It is not a de Polignac number, because 220120212002021 - 2² = 220120212002017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220120212002521) 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, 245122730066 + ... + 245122730963.

It is an arithmetic number, because the mean of its divisors is an integer number (55152614365875).

Almost surely, 2^{220120212002021} is an apocalyptic number.

It is an amenable number.

220120212002021 is a deficient number, since it is larger than the sum of its proper divisors (490245461479).

220120212002021 is an equidigital number, since it uses as much as digits as its factorization.

220120212002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490245461478.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 220120212002021 its reverse (120200212021022), we get a palindrome (340320424023043).

The spelling of 220120212002021 in words is "two hundred twenty trillion, one hundred twenty billion, two hundred twelve million, two thousand, twenty-one".