15123215142 has 48 divisors (see below), whose sum is σ = 37455593760. Its totient is φ = 4320038016.

The previous prime is 15123215101. The next prime is 15123215153. The reversal of 15123215142 is 24151232151.

It is a happy number.

15123215142 is a `hidden beast` number, since 1 + 5 + 123 + 21 + 514 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 847084 + ... + 864752.

It is an arithmetic number, because the mean of its divisors is an integer number (780324870).

Almost surely, 2^15123215142 is an apocalyptic number.

15123215142 is an abundant number, since it is smaller than the sum of its proper divisors (22332378618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15123215142 is a wasteful number, since it uses less digits than its factorization.

15123215142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24477 (or 24474 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 15123215142 its reverse (24151232151), we get a palindrome (39274447293).

The spelling of 15123215142 in words is "fifteen billion, one hundred twenty-three million, two hundred fifteen thousand, one hundred forty-two".