15123120105 has 16 divisors (see below), whose sum is σ = 24311674944. Its totient is φ = 8027436480.

The previous prime is 15123120101. The next prime is 15123120139. The reversal of 15123120105 is 50102132151.

It is not a de Polignac number, because 15123120105 - 2² = 15123120101 is a prime.

It is a super-2 number, since 2×15123120105² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15123120101) 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, 2385954 + ... + 2392283.

It is an arithmetic number, because the mean of its divisors is an integer number (1519479684).

Almost surely, 2^15123120105 is an apocalyptic number.

15123120105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15123120105 is a deficient number, since it is larger than the sum of its proper divisors (9188554839).

15123120105 is a wasteful number, since it uses less digits than its factorization.

15123120105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778456.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 15123120105 its reverse (50102132151), we get a palindrome (65225252256).

The spelling of 15123120105 in words is "fifteen billion, one hundred twenty-three million, one hundred twenty thousand, one hundred five".