1204479721 has 2 divisors, whose sum is σ = 1204479722. Its totient is φ = 1204479720.

The previous prime is 1204479719. The next prime is 1204479743. The reversal of 1204479721 is 1279744021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1066675600 + 137804121 = 32660^2 + 11739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204479721 - 2¹ = 1204479719 is a prime.

Together with 1204479719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1204479781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602239860 + 602239861.

It is an arithmetic number, because the mean of its divisors is an integer number (602239861).

Almost surely, 2^1204479721 is an apocalyptic number.

It is an amenable number.

1204479721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204479721 is an equidigital number, since it uses as much as digits as its factorization.

1204479721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 1204479721 is about 34705.6151220519. The cubic root of 1204479721 is about 1063.9792643108.

The spelling of 1204479721 in words is "one billion, two hundred four million, four hundred seventy-nine thousand, seven hundred twenty-one".