42189232381 has 2 divisors, whose sum is σ = 42189232382. Its totient is φ = 42189232380.

The previous prime is 42189232369. The next prime is 42189232399. The reversal of 42189232381 is 18323298124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31134602500 + 11054629881 = 176450^2 + 105141^2 .

It is a cyclic number.

It is not a de Polignac number, because 42189232381 - 2¹⁷ = 42189101309 is a prime.

It is a super-2 number, since 2×42189232381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42189232301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21094616190 + 21094616191.

It is an arithmetic number, because the mean of its divisors is an integer number (21094616191).

Almost surely, 2^42189232381 is an apocalyptic number.

It is an amenable number.

42189232381 is a deficient number, since it is larger than the sum of its proper divisors (1).

42189232381 is an equidigital number, since it uses as much as digits as its factorization.

42189232381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The spelling of 42189232381 in words is "forty-two billion, one hundred eighty-nine million, two hundred thirty-two thousand, three hundred eighty-one".