100010221561 has 4 divisors (see below), whose sum is σ = 100161982800. Its totient is φ = 99858460324.

The previous prime is 100010221471. The next prime is 100010221613. The reversal of 100010221561 is 165122010001.

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 100010221561 - 2²¹ = 100008124409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100010221361) 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, 75879631 + ... + 75880948.

It is an arithmetic number, because the mean of its divisors is an integer number (25040495700).

Almost surely, 2^100010221561 is an apocalyptic number.

It is an amenable number.

100010221561 is a deficient number, since it is larger than the sum of its proper divisors (151761239).

100010221561 is an equidigital number, since it uses as much as digits as its factorization.

100010221561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151761238.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 100010221561 its reverse (165122010001), we get a palindrome (265132231562).

The spelling of 100010221561 in words is "one hundred billion, ten million, two hundred twenty-one thousand, five hundred sixty-one".