42120102523 has 4 divisors (see below), whose sum is σ = 42129544608. Its totient is φ = 42110660440.

The previous prime is 42120102511. The next prime is 42120102553. The reversal of 42120102523 is 32520102124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42120102523 - 2⁵ = 42120102491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42120102494 and 42120102503.

It is not an unprimeable number, because it can be changed into a prime (42120102553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4714348 + ... + 4723273.

It is an arithmetic number, because the mean of its divisors is an integer number (10532386152).

Almost surely, 2^42120102523 is an apocalyptic number.

42120102523 is a deficient number, since it is larger than the sum of its proper divisors (9442085).

42120102523 is an equidigital number, since it uses as much as digits as its factorization.

42120102523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9442084.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 42120102523 its reverse (32520102124), we get a palindrome (74640204647).

The spelling of 42120102523 in words is "forty-two billion, one hundred twenty million, one hundred two thousand, five hundred twenty-three".