193140021 has 8 divisors (see below), whose sum is σ = 257592384. Its totient is φ = 128723840.

The previous prime is 193140007. The next prime is 193140041. The reversal of 193140021 is 120041391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 193140021 - 2⁶ = 193139957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 193140021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193140001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8005 + ... + 21221.

It is an arithmetic number, because the mean of its divisors is an integer number (32199048).

Almost surely, 2^193140021 is an apocalyptic number.

It is an amenable number.

193140021 is a deficient number, since it is larger than the sum of its proper divisors (64452363).

193140021 is a wasteful number, since it uses less digits than its factorization.

193140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18091.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 193140021 is about 13897.4825418131. The cubic root of 193140021 is about 578.0393776328.

The spelling of 193140021 in words is "one hundred ninety-three million, one hundred forty thousand, twenty-one".