42345533521 has 2 divisors, whose sum is σ = 42345533522. Its totient is φ = 42345533520.

The previous prime is 42345533509. The next prime is 42345533537. The reversal of 42345533521 is 12533554324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31390980625 + 10954552896 = 177175^2 + 104664^2 .

It is a cyclic number.

It is not a de Polignac number, because 42345533521 - 2¹³ = 42345525329 is a prime.

It is not a weakly prime, because it can be changed into another prime (42345533501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21172766760 + 21172766761.

It is an arithmetic number, because the mean of its divisors is an integer number (21172766761).

Almost surely, 2^42345533521 is an apocalyptic number.

It is an amenable number.

42345533521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42345533521 is an equidigital number, since it uses as much as digits as its factorization.

42345533521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 37.

It can be divided in two parts, 423455 and 33521, that added together give a 4-th power (456976 = 26⁴).

The spelling of 42345533521 in words is "forty-two billion, three hundred forty-five million, five hundred thirty-three thousand, five hundred twenty-one".