20121792551 has 8 divisors (see below), whose sum is σ = 23020625280. Its totient is φ = 17229032568.

The previous prime is 20121792541. The next prime is 20121792553. The reversal of 20121792551 is 15529712102.

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 20121792551 - 2¹⁴ = 20121776167 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 (20121792553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1511081 + ... + 1524338.

It is an arithmetic number, because the mean of its divisors is an integer number (2877578160).

Almost surely, 2^20121792551 is an apocalyptic number.

20121792551 is a deficient number, since it is larger than the sum of its proper divisors (2898832729).

20121792551 is an equidigital number, since it uses as much as digits as its factorization.

20121792551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036373.

The product of its (nonzero) digits is 12600, while the sum is 35.

The spelling of 20121792551 in words is "twenty billion, one hundred twenty-one million, seven hundred ninety-two thousand, five hundred fifty-one".