2049147721 has 2 divisors, whose sum is σ = 2049147722. Its totient is φ = 2049147720.

The previous prime is 2049147713. The next prime is 2049147731. The reversal of 2049147721 is 1277419402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1352768400 + 696379321 = 36780^2 + 26389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2049147721 - 2³ = 2049147713 is a prime.

It is not a weakly prime, because it can be changed into another prime (2049147731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1024573860 + 1024573861.

It is an arithmetic number, because the mean of its divisors is an integer number (1024573861).

Almost surely, 2^2049147721 is an apocalyptic number.

It is an amenable number.

2049147721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2049147721 is an equidigital number, since it uses as much as digits as its factorization.

2049147721 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 2049147721 is about 45267.5128651884. The cubic root of 2049147721 is about 1270.1580229929.

The spelling of 2049147721 in words is "two billion, forty-nine million, one hundred forty-seven thousand, seven hundred twenty-one".