201212111977 has 2 divisors, whose sum is σ = 201212111978. Its totient is φ = 201212111976.

The previous prime is 201212111953. The next prime is 201212112041. The reversal of 201212111977 is 779111212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188786774016 + 12425337961 = 434496^2 + 111469^2 .

It is a cyclic number.

It is not a de Polignac number, because 201212111977 - 2¹⁵ = 201212079209 is a prime.

It is not a weakly prime, because it can be changed into another prime (201212111927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100606055988 + 100606055989.

It is an arithmetic number, because the mean of its divisors is an integer number (100606055989).

Almost surely, 2^201212111977 is an apocalyptic number.

It is an amenable number.

201212111977 is a deficient number, since it is larger than the sum of its proper divisors (1).

201212111977 is an equidigital number, since it uses as much as digits as its factorization.

201212111977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 34.

The spelling of 201212111977 in words is "two hundred one billion, two hundred twelve million, one hundred eleven thousand, nine hundred seventy-seven".