12421111515 has 16 divisors (see below), whose sum is σ = 19875230496. Its totient is φ = 6624108800.

The previous prime is 12421111513. The next prime is 12421111517. The reversal of 12421111515 is 51511112421.

It is an interprime number because it is at equal distance from previous prime (12421111513) and next prime (12421111517).

It is not a de Polignac number, because 12421111515 - 2¹ = 12421111513 is a prime.

It is a super-2 number, since 2×12421111515² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12421111511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294025 + ... + 333605.

It is an arithmetic number, because the mean of its divisors is an integer number (1242201906).

Almost surely, 2^12421111515 is an apocalyptic number.

12421111515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12421111515 is a deficient number, since it is larger than the sum of its proper divisors (7454118981).

12421111515 is a wasteful number, since it uses less digits than its factorization.

12421111515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60510.

The product of its digits is 400, while the sum is 24.

Adding to 12421111515 its reverse (51511112421), we get a palindrome (63932223936).

The spelling of 12421111515 in words is "twelve billion, four hundred twenty-one million, one hundred eleven thousand, five hundred fifteen".