70121 has 2 divisors, whose sum is σ = 70122. Its totient is φ = 70120.

The previous prime is 70117. The next prime is 70123. The reversal of 70121 is 12107.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44521 + 25600 = 211^2 + 160^2 .

It is an emirp because it is prime and its reverse (12107) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70121 - 2² = 70117 is a prime.

Together with 70123, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 70121.

It is not a weakly prime, because it can be changed into another prime (70123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35060 + 35061.

It is an arithmetic number, because the mean of its divisors is an integer number (35061).

2⁷⁰¹²¹ is an apocalyptic number.

It is an amenable number.

70121 is a deficient number, since it is larger than the sum of its proper divisors (1).

70121 is an equidigital number, since it uses as much as digits as its factorization.

70121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 70121 is about 264.8037008805. The cubic root of 70121 is about 41.2365857821.

Subtracting from 70121 its product of nonzero digits (14), we obtain a palindrome (70107).

Adding to 70121 its reverse (12107), we get a palindrome (82228).

It can be divided in two parts, 70 and 121, that added together give a palindrome (191).

The spelling of 70121 in words is "seventy thousand, one hundred twenty-one", and thus it is an iban number.