21835673870 has 16 divisors (see below), whose sum is σ = 39430598688. Its totient is φ = 8706183840.

The previous prime is 21835673863. The next prime is 21835673879. The reversal of 21835673870 is 7837653812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835673879) 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, 3507449 + ... + 3513668.

It is an arithmetic number, because the mean of its divisors is an integer number (2464412418).

Almost surely, 2^21835673870 is an apocalyptic number.

21835673870 is a deficient number, since it is larger than the sum of its proper divisors (17594924818).

21835673870 is a wasteful number, since it uses less digits than its factorization.

21835673870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021435.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 21835673870 in words is "twenty-one billion, eight hundred thirty-five million, six hundred seventy-three thousand, eight hundred seventy".