1221204893 has 2 divisors, whose sum is σ = 1221204894. Its totient is φ = 1221204892.

The previous prime is 1221204847. The next prime is 1221204931. The reversal of 1221204893 is 3984021221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620856889 + 600348004 = 24917^2 + 24502^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221204893 - 2¹⁰ = 1221203869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221204293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610602446 + 610602447.

It is an arithmetic number, because the mean of its divisors is an integer number (610602447).

Almost surely, 2^1221204893 is an apocalyptic number.

It is an amenable number.

1221204893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221204893 is an equidigital number, since it uses as much as digits as its factorization.

1221204893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1221204893 is about 34945.7421297645. The cubic root of 1221204893 is about 1068.8813805270.

The spelling of 1221204893 in words is "one billion, two hundred twenty-one million, two hundred four thousand, eight hundred ninety-three".