100124211221 has 4 divisors (see below), whose sum is σ = 100135055244. Its totient is φ = 100113367200.

The previous prime is 100124211217. The next prime is 100124211223. The reversal of 100124211221 is 122112421001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122112421001 = 254179 ⋅480419.

It can be written as a sum of positive squares in 2 ways, for example, as 86924728900 + 13199482321 = 294830^2 + 114889^2 .

It is a cyclic number.

It is not a de Polignac number, because 100124211221 - 2² = 100124211217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100124211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100124211223) 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, 5408150 + ... + 5426631.

It is an arithmetic number, because the mean of its divisors is an integer number (25033763811).

Almost surely, 2^100124211221 is an apocalyptic number.

It is an amenable number.

100124211221 is a deficient number, since it is larger than the sum of its proper divisors (10844023).

100124211221 is an equidigital number, since it uses as much as digits as its factorization.

100124211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10844022.

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

Adding to 100124211221 its reverse (122112421001), we get a palindrome (222236632222).

The spelling of 100124211221 in words is "one hundred billion, one hundred twenty-four million, two hundred eleven thousand, two hundred twenty-one".