100522220621 has 4 divisors (see below), whose sum is σ = 100523563644. Its totient is φ = 100520877600.

The previous prime is 100522220581. The next prime is 100522220657. The reversal of 100522220621 is 126022225001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126022225001 = 2411 ⋅52269691.

It can be written as a sum of positive squares in 2 ways, for example, as 51773996521 + 48748224100 = 227539^2 + 220790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100522220621 is a prime.

It is a super-3 number, since 3×100522220621³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100522220681) 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, 552170 + ... + 711291.

It is an arithmetic number, because the mean of its divisors is an integer number (25130890911).

Almost surely, 2^100522220621 is an apocalyptic number.

It is an amenable number.

100522220621 is a deficient number, since it is larger than the sum of its proper divisors (1343023).

100522220621 is an equidigital number, since it uses as much as digits as its factorization.

100522220621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343022.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 100522220621 its reverse (126022225001), we get a palindrome (226544445622).

The spelling of 100522220621 in words is "one hundred billion, five hundred twenty-two million, two hundred twenty thousand, six hundred twenty-one".