44145552421 has 2 divisors, whose sum is σ = 44145552422. Its totient is φ = 44145552420.

The previous prime is 44145552331. The next prime is 44145552433. The reversal of 44145552421 is 12425554144.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39636429921 + 4509122500 = 199089^2 + 67150^2 .

It is a cyclic number.

It is not a de Polignac number, because 44145552421 - 2⁹ = 44145551909 is a prime.

It is a super-2 number, since 2×44145552421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44145552461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22072776210 + 22072776211.

It is an arithmetic number, because the mean of its divisors is an integer number (22072776211).

Almost surely, 2^44145552421 is an apocalyptic number.

It is an amenable number.

44145552421 is a deficient number, since it is larger than the sum of its proper divisors (1).

44145552421 is an equidigital number, since it uses as much as digits as its factorization.

44145552421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128000, while the sum is 37.

The spelling of 44145552421 in words is "forty-four billion, one hundred forty-five million, five hundred fifty-two thousand, four hundred twenty-one".