43451053421 has 2 divisors, whose sum is σ = 43451053422. Its totient is φ = 43451053420.

The previous prime is 43451053409. The next prime is 43451053427. The reversal of 43451053421 is 12435015434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24175896196 + 19275157225 = 155486^2 + 138835^2 .

It is a cyclic number.

It is not a de Polignac number, because 43451053421 - 2¹⁰ = 43451052397 is a prime.

It is a super-5 number, since 5×43451053421⁵ (a number of 54 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43451053427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21725526710 + 21725526711.

It is an arithmetic number, because the mean of its divisors is an integer number (21725526711).

Almost surely, 2^43451053421 is an apocalyptic number.

It is an amenable number.

43451053421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43451053421 is an equidigital number, since it uses as much as digits as its factorization.

43451053421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 43451053421 its reverse (12435015434), we get a palindrome (55886068855).

The spelling of 43451053421 in words is "forty-three billion, four hundred fifty-one million, fifty-three thousand, four hundred twenty-one".