70219321 has 4 divisors (see below), whose sum is σ = 70239312. Its totient is φ = 70199332.

The previous prime is 70219313. The next prime is 70219343. The reversal of 70219321 is 12391207.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12391207 = 29 ⋅427283.

It is a cyclic number.

It is not a de Polignac number, because 70219321 - 2³ = 70219313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70219351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3175 + ... + 12268.

It is an arithmetic number, because the mean of its divisors is an integer number (17559828).

Almost surely, 2^70219321 is an apocalyptic number.

It is an amenable number.

70219321 is a deficient number, since it is larger than the sum of its proper divisors (19991).

70219321 is a wasteful number, since it uses less digits than its factorization.

70219321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19990.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 70219321 is about 8379.6969515610. The cubic root of 70219321 is about 412.5585023852.

The spelling of 70219321 in words is "seventy million, two hundred nineteen thousand, three hundred twenty-one".