1221200000249 has 2 divisors, whose sum is σ = 1221200000250. Its totient is φ = 1221200000248.

The previous prime is 1221200000203. The next prime is 1221200000269. The reversal of 1221200000249 is 9420000021221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1164441702649 + 56758297600 = 1079093^2 + 238240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221200000249 - 2²⁴ = 1221183223033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221200000269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600000124 + 610600000125.

It is an arithmetic number, because the mean of its divisors is an integer number (610600000125).

Almost surely, 2^{1221200000249} is an apocalyptic number.

It is an amenable number.

1221200000249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221200000249 is an equidigital number, since it uses as much as digits as its factorization.

1221200000249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 1221200000249 in words is "one trillion, two hundred twenty-one billion, two hundred million, two hundred forty-nine", and thus it is an aban number.