123421515 has 32 divisors (see below), whose sum is σ = 226146816. Its totient is φ = 56305920.

The previous prime is 123421499. The next prime is 123421523. The reversal of 123421515 is 515124321.

It is a happy number.

It is not a de Polignac number, because 123421515 - 2⁴ = 123421499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70855 + ... + 72575.

It is an arithmetic number, because the mean of its divisors is an integer number (7067088).

Almost surely, 2^123421515 is an apocalyptic number.

123421515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123421515 is a deficient number, since it is larger than the sum of its proper divisors (102725301).

123421515 is a wasteful number, since it uses less digits than its factorization.

123421515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419.

The product of its digits is 1200, while the sum is 24.

The square root of 123421515 is about 11109.5236171494. The cubic root of 123421515 is about 497.8864315793.

Adding to 123421515 its reverse (515124321), we get a palindrome (638545836).

The spelling of 123421515 in words is "one hundred twenty-three million, four hundred twenty-one thousand, five hundred fifteen".