15230215421 has 2 divisors, whose sum is σ = 15230215422. Its totient is φ = 15230215420.

The previous prime is 15230215409. The next prime is 15230215471. The reversal of 15230215421 is 12451203251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11913722500 + 3316492921 = 109150^2 + 57589^2 .

It is a cyclic number.

It is not a de Polignac number, because 15230215421 - 2²⁶ = 15163106557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15230215471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7615107710 + 7615107711.

It is an arithmetic number, because the mean of its divisors is an integer number (7615107711).

Almost surely, 2^15230215421 is an apocalyptic number.

It is an amenable number.

15230215421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15230215421 is an equidigital number, since it uses as much as digits as its factorization.

15230215421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 15230215421 its reverse (12451203251), we get a palindrome (27681418672).

The spelling of 15230215421 in words is "fifteen billion, two hundred thirty million, two hundred fifteen thousand, four hundred twenty-one".