105644433421 has 2 divisors, whose sum is σ = 105644433422. Its totient is φ = 105644433420.

The previous prime is 105644433379. The next prime is 105644433431. The reversal of 105644433421 is 124334446501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90684697321 + 14959736100 = 301139^2 + 122310^2 .

It is a cyclic number.

It is not a de Polignac number, because 105644433421 - 2³³ = 97054498829 is a prime.

It is a super-2 number, since 2×105644433421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105644433431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52822216710 + 52822216711.

It is an arithmetic number, because the mean of its divisors is an integer number (52822216711).

Almost surely, 2^105644433421 is an apocalyptic number.

It is an amenable number.

105644433421 is a deficient number, since it is larger than the sum of its proper divisors (1).

105644433421 is an equidigital number, since it uses as much as digits as its factorization.

105644433421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 105644433421 its reverse (124334446501), we get a palindrome (229978879922).

The spelling of 105644433421 in words is "one hundred five billion, six hundred forty-four million, four hundred thirty-three thousand, four hundred twenty-one".