70221755 has 4 divisors (see below), whose sum is σ = 84266112. Its totient is φ = 56177400.

The previous prime is 70221743. The next prime is 70221779. The reversal of 70221755 is 55712207.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55712207 = 2897 ⋅19231.

It is not a de Polignac number, because 70221755 - 2¹² = 70217659 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7022171 + ... + 7022180.

It is an arithmetic number, because the mean of its divisors is an integer number (21066528).

Almost surely, 2^70221755 is an apocalyptic number.

70221755 is a deficient number, since it is larger than the sum of its proper divisors (14044357).

70221755 is a wasteful number, since it uses less digits than its factorization.

70221755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14044356.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 70221755 is about 8379.8421822848. The cubic root of 70221755 is about 412.5632691444.

The spelling of 70221755 in words is "seventy million, two hundred twenty-one thousand, seven hundred fifty-five".