220121212210313 has 4 divisors (see below), whose sum is σ = 222390503057940. Its totient is φ = 217851921362688.

The previous prime is 220121212210279. The next prime is 220121212210337. The reversal of 220121212210313 is 313012212121022.

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 154474870579264 + 65646341631049 = 12428792^2 + 8102243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220121212210313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220121212210513) 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, 1134645423668 + ... + 1134645423861.

It is an arithmetic number, because the mean of its divisors is an integer number (55597625764485).

Almost surely, 2^{220121212210313} is an apocalyptic number.

It is an amenable number.

220121212210313 is a deficient number, since it is larger than the sum of its proper divisors (2269290847627).

220121212210313 is an equidigital number, since it uses as much as digits as its factorization.

220121212210313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2269290847626.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 220121212210313 its reverse (313012212121022), we get a palindrome (533133424331335).

The spelling of 220121212210313 in words is "two hundred twenty trillion, one hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, three hundred thirteen".