20123210199977 has 8 divisors (see below), whose sum is σ = 20384951764320. Its totient is φ = 19862260593120.

The previous prime is 20123210199949. The next prime is 20123210199979. The reversal of 20123210199977 is 77999101232102.

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 20123210199977 - 2⁸ = 20123210199721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123210199979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197938223 + ... + 198039860.

It is an arithmetic number, because the mean of its divisors is an integer number (2548118970540).

Almost surely, 2^{20123210199977} is an apocalyptic number.

It is an amenable number.

20123210199977 is a deficient number, since it is larger than the sum of its proper divisors (261741564343).

20123210199977 is an equidigital number, since it uses as much as digits as its factorization.

20123210199977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395978743.

The product of its (nonzero) digits is 857304, while the sum is 53.

The spelling of 20123210199977 in words is "twenty trillion, one hundred twenty-three billion, two hundred ten million, one hundred ninety-nine thousand, nine hundred seventy-seven".