212111121949 has 2 divisors, whose sum is σ = 212111121950. Its totient is φ = 212111121948.

The previous prime is 212111121931. The next prime is 212111122033. The reversal of 212111121949 is 949121111212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169476305625 + 42634816324 = 411675^2 + 206482^2 .

It is a cyclic number.

It is not a de Polignac number, because 212111121949 - 2⁵ = 212111121917 is a prime.

It is a super-2 number, since 2×212111121949² (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 (212111121919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106055560974 + 106055560975.

It is an arithmetic number, because the mean of its divisors is an integer number (106055560975).

Almost surely, 2^212111121949 is an apocalyptic number.

It is an amenable number.

212111121949 is a deficient number, since it is larger than the sum of its proper divisors (1).

212111121949 is an equidigital number, since it uses as much as digits as its factorization.

212111121949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 34.

The spelling of 212111121949 in words is "two hundred twelve billion, one hundred eleven million, one hundred twenty-one thousand, nine hundred forty-nine".