212100221987 has 2 divisors, whose sum is σ = 212100221988. Its totient is φ = 212100221986.

The previous prime is 212100221951. The next prime is 212100222031. The reversal of 212100221987 is 789122001212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212100221987 - 2¹⁰ = 212100220963 is a prime.

It is not a weakly prime, because it can be changed into another prime (212100220987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050110993 + 106050110994.

It is an arithmetic number, because the mean of its divisors is an integer number (106050110994).

Almost surely, 2^212100221987 is an apocalyptic number.

212100221987 is a deficient number, since it is larger than the sum of its proper divisors (1).

212100221987 is an equidigital number, since it uses as much as digits as its factorization.

212100221987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 212100221987 in words is "two hundred twelve billion, one hundred million, two hundred twenty-one thousand, nine hundred eighty-seven".