220121210221 has 8 divisors (see below), whose sum is σ = 240143072544. Its totient is φ = 200101155120.

The previous prime is 220121210203. The next prime is 220121210237. The reversal of 220121210221 is 122012121022.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 220121210221 - 2¹⁷ = 220121079149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220121210195 and 220121210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121210521) 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, 190555 + ... + 690328.

It is an arithmetic number, because the mean of its divisors is an integer number (30017884068).

Almost surely, 2^220121210221 is an apocalyptic number.

It is an amenable number.

220121210221 is a deficient number, since it is larger than the sum of its proper divisors (20021862323).

220121210221 is a wasteful number, since it uses less digits than its factorization.

220121210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903611.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 220121210221 its reverse (122012121022), we get a palindrome (342133331243).

The spelling of 220121210221 in words is "two hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".