42044154521 has 2 divisors, whose sum is σ = 42044154522. Its totient is φ = 42044154520.

The previous prime is 42044154517. The next prime is 42044154533. The reversal of 42044154521 is 12545144024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21123424921 + 20920729600 = 145339^2 + 144640^2 .

It is a cyclic number.

It is not a de Polignac number, because 42044154521 - 2² = 42044154517 is a prime.

It is not a weakly prime, because it can be changed into another prime (42044150521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21022077260 + 21022077261.

It is an arithmetic number, because the mean of its divisors is an integer number (21022077261).

Almost surely, 2^42044154521 is an apocalyptic number.

It is an amenable number.

42044154521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42044154521 is an equidigital number, since it uses as much as digits as its factorization.

42044154521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25600, while the sum is 32.

Adding to 42044154521 its reverse (12545144024), we get a palindrome (54589298545).

The spelling of 42044154521 in words is "forty-two billion, forty-four million, one hundred fifty-four thousand, five hundred twenty-one".