220021112212021 has 8 divisors (see below), whose sum is σ = 233207983407384. Its totient is φ = 206861402442240.

The previous prime is 220021112212007. The next prime is 220021112212061. The reversal of 220021112212021 is 120212211120022.

It can be written as a sum of positive squares in 4 ways, for example, as 74516361585796 + 145504750626225 = 8632286^2 + 12062535^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220021112212021 - 2¹³ = 220021112203829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220021112212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021112212001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6790339710 + ... + 6790372111.

It is an arithmetic number, because the mean of its divisors is an integer number (29150997925923).

Almost surely, 2^{220021112212021} is an apocalyptic number.

It is an amenable number.

220021112212021 is a deficient number, since it is larger than the sum of its proper divisors (13186871195363).

220021112212021 is a wasteful number, since it uses less digits than its factorization.

220021112212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13580712791.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 220021112212021 its reverse (120212211120022), we get a palindrome (340233323332043).

The spelling of 220021112212021 in words is "two hundred twenty trillion, twenty-one billion, one hundred twelve million, two hundred twelve thousand, twenty-one".