220220212213021 has 4 divisors (see below), whose sum is σ = 220220746817500. Its totient is φ = 220219677608544.

The previous prime is 220220212213019. The next prime is 220220212213049. The reversal of 220220212213021 is 120312212022022.

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 42329011905625 + 177891200307396 = 6506075^2 + 13337586^2 .

It is a cyclic number.

It is not a de Polignac number, because 220220212213021 - 2¹ = 220220212213019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220220212212983 and 220220212213001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220220212213051) 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, 266683866 + ... + 267508363.

It is an arithmetic number, because the mean of its divisors is an integer number (55055186704375).

Almost surely, 2^{220220212213021} is an apocalyptic number.

It is an amenable number.

220220212213021 is a deficient number, since it is larger than the sum of its proper divisors (534604479).

220220212213021 is an equidigital number, since it uses as much as digits as its factorization.

220220212213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534604478.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 220220212213021 its reverse (120312212022022), we get a palindrome (340532424235043).

The spelling of 220220212213021 in words is "two hundred twenty trillion, two hundred twenty billion, two hundred twelve million, two hundred thirteen thousand, twenty-one".