100000211221 has 4 divisors (see below), whose sum is σ = 100763571744. Its totient is φ = 99236850700.

The previous prime is 100000211197. The next prime is 100000211237. The reversal of 100000211221 is 122112000001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100000211221 - 2⁵ = 100000211189 is a prime.

It is a super-2 number, since 2×100000211221² (a number of 23 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 = 100000211198 and 100000211207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000211921) 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, 381680065 + ... + 381680326.

It is an arithmetic number, because the mean of its divisors is an integer number (25190892936).

Almost surely, 2^100000211221 is an apocalyptic number.

It is an amenable number.

100000211221 is a deficient number, since it is larger than the sum of its proper divisors (763360523).

100000211221 is an equidigital number, since it uses as much as digits as its factorization.

100000211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763360522.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100000211221 its reverse (122112000001), we get a palindrome (222112211222).

The spelling of 100000211221 in words is "one hundred billion, two hundred eleven thousand, two hundred twenty-one".