82703021 has 2 divisors, whose sum is σ = 82703022. Its totient is φ = 82703020.

The previous prime is 82703003. The next prime is 82703057. The reversal of 82703021 is 12030728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78234025 + 4468996 = 8845^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 82703021 - 2⁶ = 82702957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82703821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41351510 + 41351511.

It is an arithmetic number, because the mean of its divisors is an integer number (41351511).

Almost surely, 2^82703021 is an apocalyptic number.

It is an amenable number.

82703021 is a deficient number, since it is larger than the sum of its proper divisors (1).

82703021 is an equidigital number, since it uses as much as digits as its factorization.

82703021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 82703021 is about 9094.1201333609. The cubic root of 82703021 is about 435.6861870159.

Adding to 82703021 its reverse (12030728), we get a palindrome (94733749).

The spelling of 82703021 in words is "eighty-two million, seven hundred three thousand, twenty-one".