15230121505 has 4 divisors (see below), whose sum is σ = 18276145812. Its totient is φ = 12184097200.

The previous prime is 15230121493. The next prime is 15230121521. The reversal of 15230121505 is 50512103251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50512103251 = 17609 ⋅2868539.

It can be written as a sum of positive squares in 2 ways, for example, as 3795668881 + 11434452624 = 61609^2 + 106932^2 .

It is not a de Polignac number, because 15230121505 - 2¹³ = 15230113313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15230121505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523012146 + ... + 1523012155.

It is an arithmetic number, because the mean of its divisors is an integer number (4569036453).

Almost surely, 2^15230121505 is an apocalyptic number.

It is an amenable number.

15230121505 is a deficient number, since it is larger than the sum of its proper divisors (3046024307).

15230121505 is an equidigital number, since it uses as much as digits as its factorization.

15230121505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046024306.

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 15230121505 its reverse (50512103251), we get a palindrome (65742224756).

The spelling of 15230121505 in words is "fifteen billion, two hundred thirty million, one hundred twenty-one thousand, five hundred five".