821045707 has 2 divisors, whose sum is σ = 821045708. Its totient is φ = 821045706.

The previous prime is 821045699. The next prime is 821045713. The reversal of 821045707 is 707540128.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 821045707 - 2³ = 821045699 is a prime.

It is not a weakly prime, because it can be changed into another prime (821045747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410522853 + 410522854.

It is an arithmetic number, because the mean of its divisors is an integer number (410522854).

Almost surely, 2^821045707 is an apocalyptic number.

821045707 is a deficient number, since it is larger than the sum of its proper divisors (1).

821045707 is an equidigital number, since it uses as much as digits as its factorization.

821045707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 821045707 is about 28653.8951453376. The cubic root of 821045707 is about 936.3878678828.

The spelling of 821045707 in words is "eight hundred twenty-one million, forty-five thousand, seven hundred seven".