15534000421 has 2 divisors, whose sum is σ = 15534000422. Its totient is φ = 15534000420.

The previous prime is 15534000403. The next prime is 15534000473. The reversal of 15534000421 is 12400043551.

It is a happy number.

15534000421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9679608225 + 5854392196 = 98385^2 + 76514^2 .

It is a cyclic number.

It is not a de Polignac number, because 15534000421 - 2⁹ = 15533999909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15534003421) 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, 7767000210 + 7767000211.

It is an arithmetic number, because the mean of its divisors is an integer number (7767000211).

Almost surely, 2^15534000421 is an apocalyptic number.

It is an amenable number.

15534000421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15534000421 is an equidigital number, since it uses as much as digits as its factorization.

15534000421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 15534000421 its reverse (12400043551), we get a palindrome (27934043972).

The spelling of 15534000421 in words is "fifteen billion, five hundred thirty-four million, four hundred twenty-one", and thus it is an aban number.