70421218 has 8 divisors (see below), whose sum is σ = 120722112. Its totient is φ = 30180516.

The previous prime is 70421213. The next prime is 70421227. The reversal of 70421218 is 81212407.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 70421192 and 70421201.

It is not an unprimeable number, because it can be changed into a prime (70421213) 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, 2515030 + ... + 2515057.

It is an arithmetic number, because the mean of its divisors is an integer number (15090264).

Almost surely, 2^70421218 is an apocalyptic number.

70421218 is a deficient number, since it is larger than the sum of its proper divisors (50300894).

70421218 is a wasteful number, since it uses less digits than its factorization.

70421218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030096.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 70421218 is about 8391.7351006809. The cubic root of 70421218 is about 412.9535248178.

The spelling of 70421218 in words is "seventy million, four hundred twenty-one thousand, two hundred eighteen".