211220099989 has 2 divisors, whose sum is σ = 211220099990. Its totient is φ = 211220099988.

The previous prime is 211220099983. The next prime is 211220100031. The reversal of 211220099989 is 989990022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112202891089 + 99017208900 = 334967^2 + 314670^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220099989 - 2⁵ = 211220099957 is a prime.

It is a super-2 number, since 2×211220099989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220099983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610049994 + 105610049995.

It is an arithmetic number, because the mean of its divisors is an integer number (105610049995).

Almost surely, 2^211220099989 is an apocalyptic number.

It is an amenable number.

211220099989 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220099989 is an equidigital number, since it uses as much as digits as its factorization.

211220099989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 52.

The spelling of 211220099989 in words is "two hundred eleven billion, two hundred twenty million, ninety-nine thousand, nine hundred eighty-nine".