1204721123 has 2 divisors, whose sum is σ = 1204721124. Its totient is φ = 1204721122.

The previous prime is 1204721093. The next prime is 1204721129. The reversal of 1204721123 is 3211274021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1204721123 - 2¹² = 1204717027 is a prime.

It is a super-2 number, since 2×1204721123² = 2902705968404762258, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1204721129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602360561 + 602360562.

It is an arithmetic number, because the mean of its divisors is an integer number (602360562).

Almost surely, 2^1204721123 is an apocalyptic number.

1204721123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204721123 is an equidigital number, since it uses as much as digits as its factorization.

1204721123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1204721123 is about 34709.0928000142. The cubic root of 1204721123 is about 1064.0503405220.

Adding to 1204721123 its reverse (3211274021), we get a palindrome (4415995144).

The spelling of 1204721123 in words is "one billion, two hundred four million, seven hundred twenty-one thousand, one hundred twenty-three".