394142110421 has 2 divisors, whose sum is σ = 394142110422. Its totient is φ = 394142110420.

The previous prime is 394142110409. The next prime is 394142110507. The reversal of 394142110421 is 124011241493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311459983396 + 82682127025 = 558086^2 + 287545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394142110421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394142100421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197071055210 + 197071055211.

It is an arithmetic number, because the mean of its divisors is an integer number (197071055211).

Almost surely, 2^394142110421 is an apocalyptic number.

It is an amenable number.

394142110421 is a deficient number, since it is larger than the sum of its proper divisors (1).

394142110421 is an equidigital number, since it uses as much as digits as its factorization.

394142110421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 394142110421 in words is "three hundred ninety-four billion, one hundred forty-two million, one hundred ten thousand, four hundred twenty-one".