82907021 has 2 divisors, whose sum is σ = 82907022. Its totient is φ = 82907020.

The previous prime is 82907017. The next prime is 82907023. The reversal of 82907021 is 12070928.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54922921 + 27984100 = 7411^2 + 5290^2 .

It is a cyclic number.

It is not a de Polignac number, because 82907021 - 2² = 82907017 is a prime.

Together with 82907023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82907023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41453510 + 41453511.

It is an arithmetic number, because the mean of its divisors is an integer number (41453511).

Almost surely, 2^82907021 is an apocalyptic number.

It is an amenable number.

82907021 is a deficient number, since it is larger than the sum of its proper divisors (1).

82907021 is an equidigital number, since it uses as much as digits as its factorization.

82907021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 82907021 is about 9105.3292636785. The cubic root of 82907021 is about 436.0441223619.

Adding to 82907021 its reverse (12070928), we get a palindrome (94977949).

The spelling of 82907021 in words is "eighty-two million, nine hundred seven thousand, twenty-one".