20121733717 has 8 divisors (see below), whose sum is σ = 20670228896. Its totient is φ = 19573484112.

The previous prime is 20121733699. The next prime is 20121733721. The reversal of 20121733717 is 71733712102.

It is a happy number.

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 20121733717 - 2⁷ = 20121733589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121733727) 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, 111238 + ... + 229384.

It is an arithmetic number, because the mean of its divisors is an integer number (2583778612).

Almost surely, 2^20121733717 is an apocalyptic number.

It is an amenable number.

20121733717 is a deficient number, since it is larger than the sum of its proper divisors (548495179).

20121733717 is a wasteful number, since it uses less digits than its factorization.

20121733717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122787.

The product of its (nonzero) digits is 12348, while the sum is 34.

The spelling of 20121733717 in words is "twenty billion, one hundred twenty-one million, seven hundred thirty-three thousand, seven hundred seventeen".