220000020021 has 12 divisors (see below), whose sum is σ = 317790799872. Its totient is φ = 146660683176.

The previous prime is 220000020017. The next prime is 220000020043. The reversal of 220000020021 is 120020000022.

220000020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220000020021 - 2² = 220000020017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220000019985 and 220000020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220000020011) 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 11 ways as a sum of consecutive naturals, for example, 261411 + ... + 712976.

It is an arithmetic number, because the mean of its divisors is an integer number (26482566656).

Almost surely, 2^220000020021 is an apocalyptic number.

It is an amenable number.

220000020021 is a deficient number, since it is larger than the sum of its proper divisors (97790779851).

220000020021 is a wasteful number, since it uses less digits than its factorization.

220000020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999480 (or 999477 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 220000020021 its reverse (120020000022), we get a palindrome (340020020043).

The spelling of 220000020021 in words is "two hundred twenty billion, twenty thousand, twenty-one".