220121021100212 has 24 divisors (see below), whose sum is σ = 407871806908104. Its totient is φ = 103586235098112.

The previous prime is 220121021100193. The next prime is 220121021100257. The reversal of 220121021100212 is 212001120121022.

It can be written as a sum of positive squares in 4 ways, for example, as 140523148228516 + 79597872871696 = 11854246^2 + 8921764^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75487808 + ... + 78349544.

It is an arithmetic number, because the mean of its divisors is an integer number (16994658621171).

Almost surely, 2^{220121021100212} is an apocalyptic number.

It is an amenable number.

220121021100212 is a deficient number, since it is larger than the sum of its proper divisors (187750785807892).

220121021100212 is a wasteful number, since it uses less digits than its factorization.

220121021100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3992915 (or 3992913 counting only the distinct ones).

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

Adding to 220121021100212 its reverse (212001120121022), we get a palindrome (432122141221234).

The spelling of 220121021100212 in words is "two hundred twenty trillion, one hundred twenty-one billion, twenty-one million, one hundred thousand, two hundred twelve".