20121200109977 has 2 divisors, whose sum is σ = 20121200109978. Its totient is φ = 20121200109976.

The previous prime is 20121200109953. The next prime is 20121200110003. The reversal of 20121200109977 is 77990100212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19893838983001 + 227361126976 = 4460251^2 + 476824^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121200109977 - 2¹⁶ = 20121200044441 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121200109377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060600054988 + 10060600054989.

It is an arithmetic number, because the mean of its divisors is an integer number (10060600054989).

Almost surely, 2^{20121200109977} is an apocalyptic number.

It is an amenable number.

20121200109977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121200109977 is an equidigital number, since it uses as much as digits as its factorization.

20121200109977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 41.

The spelling of 20121200109977 in words is "twenty trillion, one hundred twenty-one billion, two hundred million, one hundred nine thousand, nine hundred seventy-seven".