220220202210021 has 48 divisors (see below), whose sum is σ = 343484255565360. Its totient is φ = 135156495974400.

The previous prime is 220220202210017. The next prime is 220220202210083. The reversal of 220220202210021 is 120012202022022.

220220202210021 is a `hidden beast` number, since 220 + 2 + 202 + 0 + 221 + 0 + 0 + 21 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 3000651953121 + 217219550256900 = 1732239^2 + 14738370^2 .

It is not a de Polignac number, because 220220202210021 - 2² = 220220202210017 is a prime.

It is a super-2 number, since 2×220220202210021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 220220202209976 and 220220202210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220220202210011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 248076285 + ... + 248962413.

It is an arithmetic number, because the mean of its divisors is an integer number (7155921990945).

Almost surely, 2^{220220202210021} is an apocalyptic number.

It is an amenable number.

220220202210021 is a deficient number, since it is larger than the sum of its proper divisors (123264053355339).

220220202210021 is a wasteful number, since it uses less digits than its factorization.

220220202210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891846 (or 891843 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 220220202210021 its reverse (120012202022022), we get a palindrome (340232404232043).

The spelling of 220220202210021 in words is "two hundred twenty trillion, two hundred twenty billion, two hundred two million, two hundred ten thousand, twenty-one".