220011100021 has 4 divisors (see below), whose sum is σ = 232952929452. Its totient is φ = 207069270592.

The previous prime is 220011099947. The next prime is 220011100033. The reversal of 220011100021 is 120001110022.

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 94486152996 + 125524947025 = 307386^2 + 354295^2 .

It is a cyclic number.

It is not a de Polignac number, because 220011100021 - 2¹⁷ = 220010968949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220011099980 and 220011100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220011110021) 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, 6470914690 + ... + 6470914723.

It is an arithmetic number, because the mean of its divisors is an integer number (58238232363).

Almost surely, 2^220011100021 is an apocalyptic number.

It is an amenable number.

220011100021 is a deficient number, since it is larger than the sum of its proper divisors (12941829431).

220011100021 is a wasteful number, since it uses less digits than its factorization.

220011100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12941829430.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 220011100021 its reverse (120001110022), we get a palindrome (340012210043).

The spelling of 220011100021 in words is "two hundred twenty billion, eleven million, one hundred thousand, twenty-one".