42011909901979 has 2 divisors, whose sum is σ = 42011909901980. Its totient is φ = 42011909901978.

The previous prime is 42011909901959. The next prime is 42011909901989. The reversal of 42011909901979 is 97910990911024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42011909901979 - 2¹³ = 42011909893787 is a prime.

It is a super-2 number, since 2×42011909901979² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42011909901959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21005954950989 + 21005954950990.

It is an arithmetic number, because the mean of its divisors is an integer number (21005954950990).

Almost surely, 2^{42011909901979} is an apocalyptic number.

42011909901979 is a deficient number, since it is larger than the sum of its proper divisors (1).

42011909901979 is an equidigital number, since it uses as much as digits as its factorization.

42011909901979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 61.

The spelling of 42011909901979 in words is "forty-two trillion, eleven billion, nine hundred nine million, nine hundred one thousand, nine hundred seventy-nine".