70135221 has 16 divisors (see below), whose sum is σ = 100892736. Its totient is φ = 43080576.

The previous prime is 70135207. The next prime is 70135229. The reversal of 70135221 is 12253107.

It is not a de Polignac number, because 70135221 - 2⁵ = 70135189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70135229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25321 + ... + 27953.

It is an arithmetic number, because the mean of its divisors is an integer number (6305796).

Almost surely, 2^70135221 is an apocalyptic number.

It is an amenable number.

70135221 is a deficient number, since it is larger than the sum of its proper divisors (30757515).

70135221 is a wasteful number, since it uses less digits than its factorization.

70135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332.

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

The square root of 70135221 is about 8374.6773669199. The cubic root of 70135221 is about 412.3937327730.

Adding to 70135221 its reverse (12253107), we get a palindrome (82388328).

The spelling of 70135221 in words is "seventy million, one hundred thirty-five thousand, two hundred twenty-one".