201221219977 has 4 divisors (see below), whose sum is σ = 201225465360. Its totient is φ = 201216974596.

The previous prime is 201221219951. The next prime is 201221219989. The reversal of 201221219977 is 779912122102.

201221219977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201221219977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221219677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050783 + ... + 2146660.

It is an arithmetic number, because the mean of its divisors is an integer number (50306366340).

Almost surely, 2^201221219977 is an apocalyptic number.

It is an amenable number.

201221219977 is a deficient number, since it is larger than the sum of its proper divisors (4245383).

201221219977 is an equidigital number, since it uses as much as digits as its factorization.

201221219977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245382.

The product of its (nonzero) digits is 63504, while the sum is 43.

The spelling of 201221219977 in words is "two hundred one billion, two hundred twenty-one million, two hundred nineteen thousand, nine hundred seventy-seven".