42400219973 has 2 divisors, whose sum is σ = 42400219974. Its totient is φ = 42400219972.

The previous prime is 42400219951. The next prime is 42400220029. The reversal of 42400219973 is 37991200424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36184789729 + 6215430244 = 190223^2 + 78838^2 .

It is a cyclic number.

It is not a de Polignac number, because 42400219973 - 2¹² = 42400215877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42400219973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42400219943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200109986 + 21200109987.

It is an arithmetic number, because the mean of its divisors is an integer number (21200109987).

Almost surely, 2^42400219973 is an apocalyptic number.

It is an amenable number.

42400219973 is a deficient number, since it is larger than the sum of its proper divisors (1).

42400219973 is an equidigital number, since it uses as much as digits as its factorization.

42400219973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 42400219973 in words is "forty-two billion, four hundred million, two hundred nineteen thousand, nine hundred seventy-three".