15085206421 has 2 divisors, whose sum is σ = 15085206422. Its totient is φ = 15085206420.

The previous prime is 15085206419. The next prime is 15085206473. The reversal of 15085206421 is 12460258051.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12808580625 + 2276625796 = 113175^2 + 47714^2 .

It is a cyclic number.

It is not a de Polignac number, because 15085206421 - 2¹ = 15085206419 is a prime.

Together with 15085206419, 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 (15085206481) 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, 7542603210 + 7542603211.

It is an arithmetic number, because the mean of its divisors is an integer number (7542603211).

Almost surely, 2^15085206421 is an apocalyptic number.

It is an amenable number.

15085206421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15085206421 is an equidigital number, since it uses as much as digits as its factorization.

15085206421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 15085206421 in words is "fifteen billion, eighty-five million, two hundred six thousand, four hundred twenty-one".