70421 has 4 divisors (see below), whose sum is σ = 75852. Its totient is φ = 64992.

The previous prime is 70393. The next prime is 70423. The reversal of 70421 is 12407.

70421 = 39² + 40² + ... + 64².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12407 = 19 ⋅653.

It can be written as a sum of positive squares in 2 ways, for example, as 7921 + 62500 = 89^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 70421 - 2¹⁴ = 54037 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 70396 and 70405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2696 + ... + 2721.

It is an arithmetic number, because the mean of its divisors is an integer number (18963).

2⁷⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

70421 is a deficient number, since it is larger than the sum of its proper divisors (5431).

70421 is a wasteful number, since it uses less digits than its factorization.

70421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 70421 is about 265.3695536417. The cubic root of 70421 is about 41.2953098696.

Subtracting from 70421 its sum of digits (14), we obtain a palindrome (70407).

Adding to 70421 its reverse (12407), we get a palindrome (82828).

The spelling of 70421 in words is "seventy thousand, four hundred twenty-one", and thus it is an iban number.