394608221421 has 32 divisors (see below), whose sum is σ = 578288678400. Its totient is φ = 238383230400.

The previous prime is 394608221419. The next prime is 394608221429. The reversal of 394608221421 is 124122806493.

It is a happy number.

It is not a de Polignac number, because 394608221421 - 2¹ = 394608221419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394608221429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 938655 + ... + 1292396.

It is an arithmetic number, because the mean of its divisors is an integer number (18071521200).

Almost surely, 2^394608221421 is an apocalyptic number.

It is an amenable number.

394608221421 is a deficient number, since it is larger than the sum of its proper divisors (183680456979).

394608221421 is a wasteful number, since it uses less digits than its factorization.

394608221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231209.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 394608221421 in words is "three hundred ninety-four billion, six hundred eight million, two hundred twenty-one thousand, four hundred twenty-one".