418378771021 has 4 divisors (see below), whose sum is σ = 418385695932. Its totient is φ = 418371846112.

The previous prime is 418378771007. The next prime is 418378771033. The reversal of 418378771021 is 120177873814.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 217146680100 + 201232090921 = 465990^2 + 448589^2 .

It is a cyclic number.

It is not a de Polignac number, because 418378771021 - 2⁵ = 418378770989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (418378775021) 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, 3371026 + ... + 3492931.

It is an arithmetic number, because the mean of its divisors is an integer number (104596423983).

Almost surely, 2^418378771021 is an apocalyptic number.

It is an amenable number.

418378771021 is a deficient number, since it is larger than the sum of its proper divisors (6924911).

418378771021 is an equidigital number, since it uses as much as digits as its factorization.

418378771021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6924910.

The product of its (nonzero) digits is 526848, while the sum is 49.

The spelling of 418378771021 in words is "four hundred eighteen billion, three hundred seventy-eight million, seven hundred seventy-one thousand, twenty-one".