100211121222221 has 4 divisors (see below), whose sum is σ = 100325387039772. Its totient is φ = 100096855404672.

The previous prime is 100211121222169. The next prime is 100211121222229. The reversal of 100211121222221 is 122222121112001.

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 50863797916996 + 49347323305225 = 7131886^2 + 7024765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100211121222221 is a prime.

It is a super-2 number, since 2×100211121222221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100211121222193 and 100211121222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100211121222229) 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, 57132907460 + ... + 57132909213.

It is an arithmetic number, because the mean of its divisors is an integer number (25081346759943).

Almost surely, 2^{100211121222221} is an apocalyptic number.

It is an amenable number.

100211121222221 is a deficient number, since it is larger than the sum of its proper divisors (114265817551).

100211121222221 is an equidigital number, since it uses as much as digits as its factorization.

100211121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114265817550.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 100211121222221 its reverse (122222121112001), we get a palindrome (222433242334222).

The spelling of 100211121222221 in words is "one hundred trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".