70351221 has 8 divisors (see below), whose sum is σ = 94293504. Its totient is φ = 46654880.

The previous prime is 70351217. The next prime is 70351223. The reversal of 70351221 is 12215307.

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

It is a cyclic number.

It is not a de Polignac number, because 70351221 - 2² = 70351217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70351223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60816 + ... + 61961.

It is an arithmetic number, because the mean of its divisors is an integer number (11786688).

Almost surely, 2^70351221 is an apocalyptic number.

It is an amenable number.

70351221 is a deficient number, since it is larger than the sum of its proper divisors (23942283).

70351221 is a wasteful number, since it uses less digits than its factorization.

70351221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122971.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 70351221 is about 8387.5634721890. The cubic root of 70351221 is about 412.8166574970.

Adding to 70351221 its reverse (12215307), we get a palindrome (82566528).

It can be divided in two parts, 7035 and 1221, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 70351221 in words is "seventy million, three hundred fifty-one thousand, two hundred twenty-one".