70210312721 has 2 divisors, whose sum is σ = 70210312722. Its totient is φ = 70210312720.

The previous prime is 70210312687. The next prime is 70210312763. The reversal of 70210312721 is 12721301207.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39495997696 + 30714315025 = 198736^2 + 175255^2 .

It is an emirp because it is prime and its reverse (12721301207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70210312721 - 2¹⁴ = 70210296337 is a prime.

It is a super-2 number, since 2×70210312721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70210312771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35105156360 + 35105156361.

It is an arithmetic number, because the mean of its divisors is an integer number (35105156361).

Almost surely, 2^70210312721 is an apocalyptic number.

It is an amenable number.

70210312721 is a deficient number, since it is larger than the sum of its proper divisors (1).

70210312721 is an equidigital number, since it uses as much as digits as its factorization.

70210312721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 26.

Adding to 70210312721 its reverse (12721301207), we get a palindrome (82931613928).

The spelling of 70210312721 in words is "seventy billion, two hundred ten million, three hundred twelve thousand, seven hundred twenty-one".