21170904070 has 32 divisors (see below), whose sum is σ = 39850937280. Its totient is φ = 8082560640.

The previous prime is 21170904067. The next prime is 21170904091. The reversal of 21170904070 is 7040907112.

It is a super-2 number, since 2×21170904070² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6196 + ... + 205864.

It is an arithmetic number, because the mean of its divisors is an integer number (1245341790).

Almost surely, 2^21170904070 is an apocalyptic number.

21170904070 is a deficient number, since it is larger than the sum of its proper divisors (18680033210).

21170904070 is a wasteful number, since it uses less digits than its factorization.

21170904070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200160.

The product of its (nonzero) digits is 3528, while the sum is 31.

The spelling of 21170904070 in words is "twenty-one billion, one hundred seventy million, nine hundred four thousand, seventy".