220220200000021 has 24 divisors (see below), whose sum is σ = 241348312890720. Its totient is φ = 200821066744896.

The previous prime is 220220200000019. The next prime is 220220200000049. The reversal of 220220200000021 is 120000002022022.

It is not a de Polignac number, because 220220200000021 - 2¹ = 220220200000019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220220199999947 and 220220200000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220220200000091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 290218450 + ... + 290976268.

It is an arithmetic number, because the mean of its divisors is an integer number (10056179703780).

Almost surely, 2^{220220200000021} is an apocalyptic number.

It is an amenable number.

220220200000021 is a deficient number, since it is larger than the sum of its proper divisors (21128112890699).

220220200000021 is a wasteful number, since it uses less digits than its factorization.

220220200000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778645 (or 778632 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 220220200000021 its reverse (120000002022022), we get a palindrome (340220202022043).

The spelling of 220220200000021 in words is "two hundred twenty trillion, two hundred twenty billion, two hundred million, twenty-one", and thus it is an aban number.