10217122621 has 4 divisors (see below), whose sum is σ = 10818129852. Its totient is φ = 9616115392.

The previous prime is 10217122577. The next prime is 10217122639. The reversal of 10217122621 is 12622171201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12622171201 = 79 ⋅159774319.

It can be written as a sum of positive squares in 2 ways, for example, as 3488201721 + 6728920900 = 59061^2 + 82030^2 .

It is a cyclic number.

It is not a de Polignac number, because 10217122621 - 2⁷ = 10217122493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10217122661) 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, 300503590 + ... + 300503623.

It is an arithmetic number, because the mean of its divisors is an integer number (2704532463).

Almost surely, 2^10217122621 is an apocalyptic number.

It is an amenable number.

10217122621 is a deficient number, since it is larger than the sum of its proper divisors (601007231).

10217122621 is an equidigital number, since it uses as much as digits as its factorization.

10217122621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601007230.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 10217122621 its reverse (12622171201), we get a palindrome (22839293822).

The spelling of 10217122621 in words is "ten billion, two hundred seventeen million, one hundred twenty-two thousand, six hundred twenty-one".