211220987 has 2 divisors, whose sum is σ = 211220988. Its totient is φ = 211220986.

The previous prime is 211220981. The next prime is 211220993. The reversal of 211220987 is 789022112.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (211220981) and next prime (211220993).

It is a cyclic number.

It is not a de Polignac number, because 211220987 - 2⁸ = 211220731 is a prime.

It is a super-2 number, since 2×211220987² = 89228610698508338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211220981) 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 as a sum of consecutive naturals, namely, 105610493 + 105610494.

It is an arithmetic number, because the mean of its divisors is an integer number (105610494).

Almost surely, 2^211220987 is an apocalyptic number.

211220987 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220987 is an equidigital number, since it uses as much as digits as its factorization.

211220987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 211220987 is about 14533.4437419354. The cubic root of 211220987 is about 595.5419462619.

The spelling of 211220987 in words is "two hundred eleven million, two hundred twenty thousand, nine hundred eighty-seven".