42152521 has 2 divisors, whose sum is σ = 42152522. Its totient is φ = 42152520.

The previous prime is 42152489. The next prime is 42152549. The reversal of 42152521 is 12525124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 4145296 = 6165^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 42152521 - 2⁵ = 42152489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42152492 and 42152501.

It is not a weakly prime, because it can be changed into another prime (42152221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21076260 + 21076261.

It is an arithmetic number, because the mean of its divisors is an integer number (21076261).

Almost surely, 2^42152521 is an apocalyptic number.

It is an amenable number.

42152521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42152521 is an equidigital number, since it uses as much as digits as its factorization.

42152521 is an evil number, because the sum of its binary digits is even.

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

The square root of 42152521 is about 6492.4972853287. The cubic root of 42152521 is about 348.0229236892.

Adding to 42152521 its reverse (12525124), we get a palindrome (54677645).

The spelling of 42152521 in words is "forty-two million, one hundred fifty-two thousand, five hundred twenty-one".