1221053573 has 2 divisors, whose sum is σ = 1221053574. Its totient is φ = 1221053572.

The previous prime is 1221053521. The next prime is 1221053579. The reversal of 1221053573 is 3753501221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 769618564 + 451435009 = 27742^2 + 21247^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221053573 - 2¹² = 1221049477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221053579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610526786 + 610526787.

It is an arithmetic number, because the mean of its divisors is an integer number (610526787).

Almost surely, 2^1221053573 is an apocalyptic number.

It is an amenable number.

1221053573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221053573 is an equidigital number, since it uses as much as digits as its factorization.

1221053573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 1221053573 is about 34943.5769920596. The cubic root of 1221053573 is about 1068.8372301931.

Adding to 1221053573 its reverse (3753501221), we get a palindrome (4974554794).

The spelling of 1221053573 in words is "one billion, two hundred twenty-one million, fifty-three thousand, five hundred seventy-three".