15454401421 has 2 divisors, whose sum is σ = 15454401422. Its totient is φ = 15454401420.

The previous prime is 15454401419. The next prime is 15454401433. The reversal of 15454401421 is 12410445451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9465344100 + 5989057321 = 97290^2 + 77389^2 .

It is a cyclic number.

It is not a de Polignac number, because 15454401421 - 2¹ = 15454401419 is a prime.

Together with 15454401419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15454402421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7727200710 + 7727200711.

It is an arithmetic number, because the mean of its divisors is an integer number (7727200711).

Almost surely, 2^15454401421 is an apocalyptic number.

It is an amenable number.

15454401421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15454401421 is an equidigital number, since it uses as much as digits as its factorization.

15454401421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 15454401421 its reverse (12410445451), we get a palindrome (27864846872).

The spelling of 15454401421 in words is "fifteen billion, four hundred fifty-four million, four hundred one thousand, four hundred twenty-one".