70118821 has 2 divisors, whose sum is σ = 70118822. Its totient is φ = 70118820.

The previous prime is 70118809. The next prime is 70118827. The reversal of 70118821 is 12881107.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56325025 + 13793796 = 7505^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 70118821 - 2²¹ = 68021669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70118821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70118827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35059410 + 35059411.

It is an arithmetic number, because the mean of its divisors is an integer number (35059411).

Almost surely, 2^70118821 is an apocalyptic number.

It is an amenable number.

70118821 is a deficient number, since it is larger than the sum of its proper divisors (1).

70118821 is an equidigital number, since it uses as much as digits as its factorization.

70118821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 70118821 is about 8373.6981674765. The cubic root of 70118821 is about 412.3615863737.

Adding to 70118821 its reverse (12881107), we get a palindrome (82999928).

The spelling of 70118821 in words is "seventy million, one hundred eighteen thousand, eight hundred twenty-one".