42203569721 has 2 divisors, whose sum is σ = 42203569722. Its totient is φ = 42203569720.

The previous prime is 42203569697. The next prime is 42203569729. The reversal of 42203569721 is 12796530224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21130692496 + 21072877225 = 145364^2 + 145165^2 .

It is a cyclic number.

It is not a de Polignac number, because 42203569721 - 2¹⁸ = 42203307577 is a prime.

It is a super-2 number, since 2×42203569721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42203569729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21101784860 + 21101784861.

It is an arithmetic number, because the mean of its divisors is an integer number (21101784861).

Almost surely, 2^42203569721 is an apocalyptic number.

It is an amenable number.

42203569721 is a deficient number, since it is larger than the sum of its proper divisors (1).

42203569721 is an equidigital number, since it uses as much as digits as its factorization.

42203569721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 42203569721 in words is "forty-two billion, two hundred three million, five hundred sixty-nine thousand, seven hundred twenty-one".