6236722721 has 2 divisors, whose sum is σ = 6236722722. Its totient is φ = 6236722720.

The previous prime is 6236722633. The next prime is 6236722729. The reversal of 6236722721 is 1272276326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4251040000 + 1985682721 = 65200^2 + 44561^2 .

It is a cyclic number.

It is not a de Polignac number, because 6236722721 - 2¹⁰ = 6236721697 is a prime.

It is not a weakly prime, because it can be changed into another prime (6236722729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3118361360 + 3118361361.

It is an arithmetic number, because the mean of its divisors is an integer number (3118361361).

Almost surely, 2^6236722721 is an apocalyptic number.

It is an amenable number.

6236722721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6236722721 is an equidigital number, since it uses as much as digits as its factorization.

6236722721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 38.

The square root of 6236722721 is about 78972.9239739798. The cubic root of 6236722721 is about 1840.7104535339.

The spelling of 6236722721 in words is "six billion, two hundred thirty-six million, seven hundred twenty-two thousand, seven hundred twenty-one".