70621321 has 4 divisors (see below), whose sum is σ = 71320644. Its totient is φ = 69922000.

The previous prime is 70621301. The next prime is 70621337. The reversal of 70621321 is 12312607.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55294096 + 15327225 = 7436^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 70621321 - 2²³ = 62232713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70621292 and 70621301.

It is not an unprimeable number, because it can be changed into a prime (70621301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349510 + ... + 349711.

It is an arithmetic number, because the mean of its divisors is an integer number (17830161).

Almost surely, 2^70621321 is an apocalyptic number.

It is an amenable number.

70621321 is a deficient number, since it is larger than the sum of its proper divisors (699323).

70621321 is a wasteful number, since it uses less digits than its factorization.

70621321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699322.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 70621321 is about 8403.6492668364. The cubic root of 70621321 is about 413.3442929080.

Adding to 70621321 its reverse (12312607), we get a palindrome (82933928).

The spelling of 70621321 in words is "seventy million, six hundred twenty-one thousand, three hundred twenty-one".