1002132721 has 2 divisors, whose sum is σ = 1002132722. Its totient is φ = 1002132720.

The previous prime is 1002132689. The next prime is 1002132737. The reversal of 1002132721 is 1272312001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 723610000 + 278522721 = 26900^2 + 16689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002132721 - 2⁵ = 1002132689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1002132221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501066360 + 501066361.

It is an arithmetic number, because the mean of its divisors is an integer number (501066361).

Almost surely, 2^1002132721 is an apocalyptic number.

It is an amenable number.

1002132721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002132721 is an equidigital number, since it uses as much as digits as its factorization.

1002132721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1002132721 is about 31656.4799211789. The cubic root of 1002132721 is about 1000.7104022092.

Adding to 1002132721 its reverse (1272312001), we get a palindrome (2274444722).

The spelling of 1002132721 in words is "one billion, two million, one hundred thirty-two thousand, seven hundred twenty-one".