100211220121 has 4 divisors (see below), whose sum is σ = 100211964544. Its totient is φ = 100210475700.

The previous prime is 100211220119. The next prime is 100211220143. The reversal of 100211220121 is 121022112001.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121022112001 = 7 ⋅17288873143.

It is a cyclic number.

It is not a de Polignac number, because 100211220121 - 2¹ = 100211220119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100211220521) 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, 107565 + ... + 460426.

It is an arithmetic number, because the mean of its divisors is an integer number (25052991136).

Almost surely, 2^100211220121 is an apocalyptic number.

It is an amenable number.

100211220121 is a deficient number, since it is larger than the sum of its proper divisors (744423).

100211220121 is an equidigital number, since it uses as much as digits as its factorization.

100211220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744422.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 100211220121 its reverse (121022112001), we get a palindrome (221233332122).

The spelling of 100211220121 in words is "one hundred billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty-one".