220002111010021 has 4 divisors (see below), whose sum is σ = 220002204771532. Its totient is φ = 220002017248512.

The previous prime is 220002111010007. The next prime is 220002111010051. The reversal of 220002111010021 is 120010111200022.

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 124033637687521 + 95968473322500 = 11137039^2 + 9796350^2 .

It is a cyclic number.

It is not a de Polignac number, because 220002111010021 - 2³¹ = 219999963526373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220002111009983 and 220002111010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220002111010051) 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, 43268370 + ... + 48084883.

It is an arithmetic number, because the mean of its divisors is an integer number (55000551192883).

Almost surely, 2^{220002111010021} is an apocalyptic number.

It is an amenable number.

220002111010021 is a deficient number, since it is larger than the sum of its proper divisors (93761511).

220002111010021 is an equidigital number, since it uses as much as digits as its factorization.

220002111010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93761510.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 220002111010021 its reverse (120010111200022), we get a palindrome (340012222210043).

The spelling of 220002111010021 in words is "two hundred twenty trillion, two billion, one hundred eleven million, ten thousand, twenty-one".