193742421505 has 8 divisors (see below), whose sum is σ = 232493313024. Its totient is φ = 154992332400.

The previous prime is 193742421503. The next prime is 193742421517. The reversal of 193742421505 is 505124247391.

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

It is not a de Polignac number, because 193742421505 - 2¹ = 193742421503 is a prime.

It is a super-2 number, since 2×193742421505² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193742421503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690240 + ... + 929470.

It is an arithmetic number, because the mean of its divisors is an integer number (29061664128).

Almost surely, 2^193742421505 is an apocalyptic number.

It is an amenable number.

193742421505 is a deficient number, since it is larger than the sum of its proper divisors (38750891519).

193742421505 is a wasteful number, since it uses less digits than its factorization.

193742421505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401207.

The product of its (nonzero) digits is 302400, while the sum is 43.

Adding to 193742421505 its reverse (505124247391), we get a palindrome (698866668896).

The spelling of 193742421505 in words is "one hundred ninety-three billion, seven hundred forty-two million, four hundred twenty-one thousand, five hundred five".