6721501229 has 2 divisors, whose sum is σ = 6721501230. Its totient is φ = 6721501228.

The previous prime is 6721501133. The next prime is 6721501249. The reversal of 6721501229 is 9221051276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3840280900 + 2881220329 = 61970^2 + 53677^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721501229 - 2³² = 2426533933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6721501249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360750614 + 3360750615.

It is an arithmetic number, because the mean of its divisors is an integer number (3360750615).

Almost surely, 2^6721501229 is an apocalyptic number.

It is an amenable number.

6721501229 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721501229 is an equidigital number, since it uses as much as digits as its factorization.

6721501229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 6721501229 is about 81984.7621756629. The cubic root of 6721501229 is about 1887.2181042633.

The spelling of 6721501229 in words is "six billion, seven hundred twenty-one million, five hundred one thousand, two hundred twenty-nine".