212110100101221 has 8 divisors (see below), whose sum is σ = 323215390630464. Its totient is φ = 121205771486400.

The previous prime is 212110100101219. The next prime is 212110100101231. The reversal of 212110100101221 is 122101001011212.

It is a happy number.

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

It is not a de Polignac number, because 212110100101221 - 2¹ = 212110100101219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212110100101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110100101201) 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, 5050240478580 + ... + 5050240478621.

It is an arithmetic number, because the mean of its divisors is an integer number (40401923828808).

Almost surely, 2^{212110100101221} is an apocalyptic number.

212110100101221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212110100101221 is a deficient number, since it is larger than the sum of its proper divisors (111105290529243).

212110100101221 is a wasteful number, since it uses less digits than its factorization.

212110100101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10100480957211.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212110100101221 its reverse (122101001011212), we get a palindrome (334211101112433).

Subtracting from 212110100101221 its reverse (122101001011212), we obtain a palindrome (90009099090009).

The spelling of 212110100101221 in words is "two hundred twelve trillion, one hundred ten billion, one hundred million, one hundred one thousand, two hundred twenty-one".