220021211220101 has 4 divisors (see below), whose sum is σ = 221236798022604. Its totient is φ = 218805624417600.

The previous prime is 220021211220077. The next prime is 220021211220137. The reversal of 220021211220101 is 101022112120022.

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 55041931950625 + 164979279269476 = 7419025^2 + 12844426^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021211220101 - 2¹⁰ = 220021211219077 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 220021211220101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021211226101) 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, 607793400980 + ... + 607793401341.

It is an arithmetic number, because the mean of its divisors is an integer number (55309199505651).

Almost surely, 2^{220021211220101} is an apocalyptic number.

It is an amenable number.

220021211220101 is a deficient number, since it is larger than the sum of its proper divisors (1215586802503).

220021211220101 is a wasteful number, since it uses less digits than its factorization.

220021211220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215586802502.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 220021211220101 its reverse (101022112120022), we get a palindrome (321043323340123).

The spelling of 220021211220101 in words is "two hundred twenty trillion, twenty-one billion, two hundred eleven million, two hundred twenty thousand, one hundred one".