1221300203 has 2 divisors, whose sum is σ = 1221300204. Its totient is φ = 1221300202.

The previous prime is 1221300193. The next prime is 1221300239. The reversal of 1221300203 is 3020031221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221300203 - 2⁶ = 1221300139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221000203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610650101 + 610650102.

It is an arithmetic number, because the mean of its divisors is an integer number (610650102).

Almost surely, 2^1221300203 is an apocalyptic number.

1221300203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221300203 is an equidigital number, since it uses as much as digits as its factorization.

1221300203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1221300203 is about 34947.1057886057. The cubic root of 1221300203 is about 1068.9091870632.

Adding to 1221300203 its reverse (3020031221), we get a palindrome (4241331424).

It can be divided in two parts, 122 and 1300203, that multiplied together give a triangular number (158624766 = T₁₇₈₁₁).

The spelling of 1221300203 in words is "one billion, two hundred twenty-one million, three hundred thousand, two hundred three".