188405079421 has 32 divisors (see below), whose sum is σ = 206329131008. Its totient is φ = 171004504320.

The previous prime is 188405079383. The next prime is 188405079431. The reversal of 188405079421 is 124970504881.

It is not a de Polignac number, because 188405079421 - 2¹³ = 188405071229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188405079431) 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, 82379740 + ... + 82382026.

It is an arithmetic number, because the mean of its divisors is an integer number (6447785344).

Almost surely, 2^188405079421 is an apocalyptic number.

It is an amenable number.

188405079421 is a deficient number, since it is larger than the sum of its proper divisors (17924051587).

188405079421 is a wasteful number, since it uses less digits than its factorization.

188405079421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 188405079421 in words is "one hundred eighty-eight billion, four hundred five million, seventy-nine thousand, four hundred twenty-one".