42121552 has 30 divisors (see below), whose sum is σ = 89708234. Its totient is φ = 19145280.

The previous prime is 42121549. The next prime is 42121559. The reversal of 42121552 is 25512124.

It can be written as a sum of positive squares in only one way, i.e., 41267776 + 853776 = 6424^2 + 924^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8943 + ... + 12814.

Almost surely, 2^42121552 is an apocalyptic number.

It is an amenable number.

42121552 is an abundant number, since it is smaller than the sum of its proper divisors (47586682).

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

42121552 is a wasteful number, since it uses less digits than its factorization.

42121552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21787 (or 21770 counting only the distinct ones).

The product of its digits is 800, while the sum is 22.

The square root of 42121552 is about 6490.1118634427. Note that the first 3 decimals coincide. The cubic root of 42121552 is about 347.9376732525.

Adding to 42121552 its reverse (25512124), we get a palindrome (67633676).

The spelling of 42121552 in words is "forty-two million, one hundred twenty-one thousand, five hundred fifty-two".