15271980421 has 2 divisors, whose sum is σ = 15271980422. Its totient is φ = 15271980420.

The previous prime is 15271980419. The next prime is 15271980431. The reversal of 15271980421 is 12408917251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10979896225 + 4292084196 = 104785^2 + 65514^2 .

It is a cyclic number.

It is not a de Polignac number, because 15271980421 - 2¹ = 15271980419 is a prime.

Together with 15271980419, 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 (15271980431) 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, 7635990210 + 7635990211.

It is an arithmetic number, because the mean of its divisors is an integer number (7635990211).

Almost surely, 2^15271980421 is an apocalyptic number.

It is an amenable number.

15271980421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15271980421 is an equidigital number, since it uses as much as digits as its factorization.

15271980421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 15271980421 in words is "fifteen billion, two hundred seventy-one million, nine hundred eighty thousand, four hundred twenty-one".