70221555 has 24 divisors (see below), whose sum is σ = 124018128. Its totient is φ = 36743616.

The previous prime is 70221539. The next prime is 70221581. The reversal of 70221555 is 55512207.

It is a happy number.

It is not a de Polignac number, because 70221555 - 2⁴ = 70221539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12337 + ... + 17106.

It is an arithmetic number, because the mean of its divisors is an integer number (5167422).

Almost surely, 2^70221555 is an apocalyptic number.

70221555 is a deficient number, since it is larger than the sum of its proper divisors (53796573).

70221555 is a wasteful number, since it uses less digits than its factorization.

70221555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29507 (or 29504 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 70221555 is about 8379.8302488774. The cubic root of 70221555 is about 412.5628774674.

The spelling of 70221555 in words is "seventy million, two hundred twenty-one thousand, five hundred fifty-five".