42500621 has 2 divisors, whose sum is σ = 42500622. Its totient is φ = 42500620.

The previous prime is 42500609. The next prime is 42500651. The reversal of 42500621 is 12600524.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 14822500 = 5261^2 + 3850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42500621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42500593 and 42500602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42500651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21250310 + 21250311.

It is an arithmetic number, because the mean of its divisors is an integer number (21250311).

Almost surely, 2^42500621 is an apocalyptic number.

It is an amenable number.

42500621 is a deficient number, since it is larger than the sum of its proper divisors (1).

42500621 is an equidigital number, since it uses as much as digits as its factorization.

42500621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 42500621 is about 6519.2500335545. The cubic root of 42500621 is about 348.9783020585.

The spelling of 42500621 in words is "forty-two million, five hundred thousand, six hundred twenty-one".