100813621361 has 4 divisors (see below), whose sum is σ = 100814257152. Its totient is φ = 100812985572.

The previous prime is 100813621343. The next prime is 100813621409. The reversal of 100813621361 is 163126318001.

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: 163126318001 = 9931 ⋅16425971.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100813621361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100813621061) 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, 135536 + ... + 469038.

It is an arithmetic number, because the mean of its divisors is an integer number (25203564288).

Almost surely, 2^100813621361 is an apocalyptic number.

It is an amenable number.

100813621361 is a deficient number, since it is larger than the sum of its proper divisors (635791).

100813621361 is an equidigital number, since it uses as much as digits as its factorization.

100813621361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635790.

The product of its (nonzero) digits is 5184, while the sum is 32.

Adding to 100813621361 its reverse (163126318001), we get a palindrome (263939939362).

The spelling of 100813621361 in words is "one hundred billion, eight hundred thirteen million, six hundred twenty-one thousand, three hundred sixty-one".