210000122111221 has 8 divisors (see below), whose sum is σ = 226723635038264. Its totient is φ = 193357988809920.

The previous prime is 210000122111159. The next prime is 210000122111243. The reversal of 210000122111221 is 122111221000012.

It can be written as a sum of positive squares in 4 ways, for example, as 2031679636900 + 207968442474321 = 1425370^2 + 14421111^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210000122111221 is a prime.

It is a super-2 number, since 2×210000122111221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210000122111195 and 210000122111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000122111281) 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, 20344901070 + ... + 20344911391.

It is an arithmetic number, because the mean of its divisors is an integer number (28340454379783).

Almost surely, 2^{210000122111221} is an apocalyptic number.

It is an amenable number.

210000122111221 is a deficient number, since it is larger than the sum of its proper divisors (16723512927043).

210000122111221 is a wasteful number, since it uses less digits than its factorization.

210000122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40689812871.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210000122111221 its reverse (122111221000012), we get a palindrome (332111343111233).

The spelling of 210000122111221 in words is "two hundred ten trillion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".