100212203561 has 4 divisors (see below), whose sum is σ = 100212841872. Its totient is φ = 100211565252.

The previous prime is 100212203489. The next prime is 100212203647. The reversal of 100212203561 is 165302212001.

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: 165302212001 = 11257 ⋅14684393.

It is a cyclic number.

It is not a de Polignac number, because 100212203561 - 2¹⁰ = 100212202537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100212203261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98690 + ... + 458436.

It is an arithmetic number, because the mean of its divisors is an integer number (25053210468).

Almost surely, 2^100212203561 is an apocalyptic number.

It is an amenable number.

100212203561 is a deficient number, since it is larger than the sum of its proper divisors (638311).

100212203561 is an equidigital number, since it uses as much as digits as its factorization.

100212203561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638310.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 100212203561 its reverse (165302212001), we get a palindrome (265514415562).

The spelling of 100212203561 in words is "one hundred billion, two hundred twelve million, two hundred three thousand, five hundred sixty-one".