1211000220949 has 2 divisors, whose sum is σ = 1211000220950. Its totient is φ = 1211000220948.

The previous prime is 1211000220931. The next prime is 1211000221009. The reversal of 1211000220949 is 9490220001121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1179721822500 + 31278398449 = 1086150^2 + 176857^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211000220949 - 2¹⁹ = 1210999696661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211000220949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211000220349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500110474 + 605500110475.

It is an arithmetic number, because the mean of its divisors is an integer number (605500110475).

Almost surely, 2^{1211000220949} is an apocalyptic number.

It is an amenable number.

1211000220949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211000220949 is an equidigital number, since it uses as much as digits as its factorization.

1211000220949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 1211000220949 in words is "one trillion, two hundred eleven billion, two hundred twenty thousand, nine hundred forty-nine".