105521400221 has 4 divisors (see below), whose sum is σ = 105586258272. Its totient is φ = 105456542172.

The previous prime is 105521400211. The next prime is 105521400227. The reversal of 105521400221 is 122004125501.

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 an emirpimes, since its reverse is a distinct semiprime: 122004125501 = 79 ⋅1544356019.

It is a cyclic number.

It is not a de Polignac number, because 105521400221 - 2¹⁴ = 105521383837 is a prime.

It is a super-2 number, since 2×105521400221² (a number of 23 digits) contains 22 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 (105521400227) 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, 32426585 + ... + 32429838.

It is an arithmetic number, because the mean of its divisors is an integer number (26396564568).

Almost surely, 2^105521400221 is an apocalyptic number.

It is an amenable number.

105521400221 is a deficient number, since it is larger than the sum of its proper divisors (64858051).

105521400221 is an equidigital number, since it uses as much as digits as its factorization.

105521400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64858050.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 105521400221 its reverse (122004125501), we get a palindrome (227525525722).

The spelling of 105521400221 in words is "one hundred five billion, five hundred twenty-one million, four hundred thousand, two hundred twenty-one".