212121020987 has 2 divisors, whose sum is σ = 212121020988. Its totient is φ = 212121020986.

The previous prime is 212121020977. The next prime is 212121021019. The reversal of 212121020987 is 789020121212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212121020987 - 2⁴ = 212121020971 is a prime.

It is a super-3 number, since 3×212121020987³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (212121020977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060510493 + 106060510494.

It is an arithmetic number, because the mean of its divisors is an integer number (106060510494).

Almost surely, 2^212121020987 is an apocalyptic number.

212121020987 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121020987 is an equidigital number, since it uses as much as digits as its factorization.

212121020987 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 212121020987 in words is "two hundred twelve billion, one hundred twenty-one million, twenty thousand, nine hundred eighty-seven".