42120553 has 4 divisors (see below), whose sum is σ = 42147460. Its totient is φ = 42093648.

The previous prime is 42120523. The next prime is 42120563. The reversal of 42120553 is 35502124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27741289 + 14379264 = 5267^2 + 3792^2 .

It is a cyclic number.

It is not a de Polignac number, because 42120553 - 2¹³ = 42112361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42120523) 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, 10950 + ... + 14287.

It is an arithmetic number, because the mean of its divisors is an integer number (10536865).

Almost surely, 2^42120553 is an apocalyptic number.

It is an amenable number.

42120553 is a deficient number, since it is larger than the sum of its proper divisors (26907).

42120553 is a wasteful number, since it uses less digits than its factorization.

42120553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26906.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 42120553 is about 6490.0348997521. The cubic root of 42120553 is about 347.9349225428.

Adding to 42120553 its reverse (35502124), we get a palindrome (77622677).

The spelling of 42120553 in words is "forty-two million, one hundred twenty thousand, five hundred fifty-three".