42279427921 has 2 divisors, whose sum is σ = 42279427922. Its totient is φ = 42279427920.

The previous prime is 42279427913. The next prime is 42279427979. The reversal of 42279427921 is 12972497224.

42279427921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41689472400 + 589955521 = 204180^2 + 24289^2 .

It is a cyclic number.

It is not a de Polignac number, because 42279427921 - 2³ = 42279427913 is a prime.

It is not a weakly prime, because it can be changed into another prime (42279427901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21139713960 + 21139713961.

It is an arithmetic number, because the mean of its divisors is an integer number (21139713961).

Almost surely, 2^42279427921 is an apocalyptic number.

It is an amenable number.

42279427921 is a deficient number, since it is larger than the sum of its proper divisors (1).

42279427921 is an equidigital number, since it uses as much as digits as its factorization.

42279427921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The spelling of 42279427921 in words is "forty-two billion, two hundred seventy-nine million, four hundred twenty-seven thousand, nine hundred twenty-one".