188113821 has 16 divisors (see below), whose sum is σ = 287347200. Its totient is φ = 107232048.

The previous prime is 188113817. The next prime is 188113867. The reversal of 188113821 is 128311881.

It is not a de Polignac number, because 188113821 - 2² = 188113817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188115821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1891 + ... + 19488.

It is an arithmetic number, because the mean of its divisors is an integer number (17959200).

Almost surely, 2^188113821 is an apocalyptic number.

It is an amenable number.

188113821 is a deficient number, since it is larger than the sum of its proper divisors (99233379).

188113821 is a wasteful number, since it uses less digits than its factorization.

188113821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21808.

The product of its digits is 3072, while the sum is 33.

The square root of 188113821 is about 13715.4591975624. The cubic root of 188113821 is about 572.9810184100.

The spelling of 188113821 in words is "one hundred eighty-eight million, one hundred thirteen thousand, eight hundred twenty-one".