42303251821 has 4 divisors (see below), whose sum is σ = 42311029312. Its totient is φ = 42295474332.

The previous prime is 42303251819. The next prime is 42303251827. The reversal of 42303251821 is 12815230324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42303251821 - 2¹ = 42303251819 is a prime.

It is a super-2 number, since 2×42303251821² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42303251827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3880581 + ... + 3891466.

It is an arithmetic number, because the mean of its divisors is an integer number (10577757328).

Almost surely, 2^42303251821 is an apocalyptic number.

It is an amenable number.

42303251821 is a deficient number, since it is larger than the sum of its proper divisors (7777491).

42303251821 is an equidigital number, since it uses as much as digits as its factorization.

42303251821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7777490.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 42303251821 in words is "forty-two billion, three hundred three million, two hundred fifty-one thousand, eight hundred twenty-one".